Final answer:
A Scrum Team should have less than 10 members to remain effective and maintain ease of communication. The ideal team size helps to balance efficiency and manageability within the agile framework.
Step-by-step explanation:
The size of a Scrum Team is a crucial factor in agile project management. According to the Scrum Guide, the optimal Scrum Team has 10 or fewer people. Among the options provided, the correct one is d) less than 10 members. This is so that the team remains nimble and able to communicate effectively. A too large team could lead to complexity in communication and management, while a too small team might lack the skills necessary to complete the work efficiently. The Scrum Team includes the Scrum Master, Product Owner, and Developers.