A high level Business Case is a document that provides a preliminary rationale and justification for a proposed business change or solution. It helps to establish the feasibility and desirability of the project and secure initial approval and funding for further investigation and development. Therefore, option A is the correct answer, as creating a high level Business Case would be the best activity to undertake at this point for introducing a new procurement system. A high level Business Case would help to define the problem or opportunity that motivates the project, identify and compare different procurement solutions based on their expected benefits, costs, risks and impacts, and recommend the preferred option for further analysis and evaluation. A high level Business Case would provide a solid foundation for proceeding with the project and preparing a detailed Business Case later on. Option B is not a correct answer, as creating a detailed Business Case would not be an appropriate activity to undertake at this point for introducing a new procurement system. A detailed Business Case is a document that provides a comprehensive rationale and justification for a proposed business change or solution. It helps to confirm the viability and worthiness of the project and secure final approval and funding for implementation and delivery. A detailed Business Case would require conducting extensive research and analysis on the preferred procurement solution and presenting its definitive benefits, costs, risks and impacts. A detailed Business Case would be premature and unnecessary at this point, as it would depend on the outcome of the high level Business Case first. Option C is not a correct answer, as it is too early to work on the Business Case would not be an appropriate activity to undertake at this point for introducing a new procurement system. Working on the Business Case is an essential activity for any project that involves significant business change or investment. It helps to provide evidence and support for the project and ensure its alignment with the organisation’s strategy and objectives. Working on the Business Case would not be too early at this point, as it would help to establish the feasibility and desirability of the project and secure initial approval and funding for further investigation and development. Option D is not a correct answer, as confirming with the directors the costs and benefits would not be an appropriate activity to undertake at this point for introducing a new procurement system. Confirming with the directors the costs and benefits would require preparing a high level Business Case first to estimate and compare the financial implications of different options and recommend the best one for further development and implementation. Confirming with the directors the costs and benefits without preparing a high level Business Case first would risk providing inaccurate or incomplete information that may not reflect the value or feasibility of the project.