According to the BABOK Guide, the task of assessing proposed solutions involves analyzing the feasibility, risks, impacts, and benefits of various solutions that could address the business need1. This task requires input from various stakeholders who have different perspectives and expertise on the problem and the solution domains. Among the stakeholders listed in the question, the one that will provide information on technical constraints that could limit the solutions that may be implemented is suppliers. Suppliers are external entities that provide products or services that are part of the solution or that enable the delivery of the solution2. Suppliers can provide information on the technical specifications, capabilities, limitations, costs, and availability of their products or services, which can affect the feasibility and suitability of the proposed solutions3.

The other options are not correct stakeholders for providing information on technical constraints that could limit the solutions that may be implemented:

Project manager: The project manager is responsible for planning, executing, monitoring, and controlling the project activities, resources, budget, and schedule2. The project manager can provide information on the project constraints, such as scope, time, cost, quality, and risk, but not on the technical constraints of the solutions3.

Sponsor: The sponsor is the person or group who authorizes, funds, and supports the project and the solution2. The sponsor can provide information on the business objectives, priorities, expectations, and benefits of the solutions, but not on the technical constraints of the solutions3.

Operational support: The operational support is the person or group who provides ongoing maintenance and support for the solution after it is deployed2. The operational support can provide information on the operational requirements, issues, and performance of the solutions, but not on the technical constraints of the solutions before they are implemented3. References:

1: BABOK Guide, section 6.1 Assess Proposed Solution, page 112

2: BABOK Guide, section 2.2 Stakeholder Roles, page 23-25

3: CBAP/CCBA Certified Business Analysis Study Guide, 2nd Edition, by Susan Weese and Terri Wagner, Wiley, 2011, page 296-297