A Business Activity Model (BAM) is a high-level view of the business activities that take place within an organisation. It shows how activities are related to each other and how they contribute to achieving business objectives. A BAM consists of five types of high-level activities: directing, enabling, doing, monitoring and controlling. A BAM can also show dependencies between activities using arrows to indicate which activity depends on another activity to start or finish. Therefore, option A is the correct answer, as it shows the dependencies between the four activities on the BAM correctly. Activity c (define lending policies) is a directing activity that sets the rules and guidelines for lending e-books to customers. It depends on no other activity and precedes all other activities. Activity b (establish licensing arrangements with publishers) is an enabling activity that secures the rights and permissions to lend e-books from different publishers. It depends on activity c and precedes activity a. Activity a (lend books) is a doing activity that provides e-books to customers according to their requests and preferences. It depends on activity b and precedes activity d. Activity d (monitor lending usage) is a monitoring activity that tracks and records how customers use and return e-books. It depends on activity a and follows all other activities.

References: BCS Practitioner Certificate in BAP Specimen, page 24.