Final answer:
A BCA waiver requires authorization from senior leadership or a designated approval authority within the organization or government entity responsible for the project.
Step-by-step explanation:
The entity that must authorize a BCA waiver typically depends on the context in which the term BCA is used. If we are referring to a Business Case Analysis (BCA) in the context of project management or government procurement, a BCA waiver would generally require approval from senior leadership within the organization or government entity responsible for the project. This could mean a high-ranking official or a designated approval authority. On the other hand, if BCA stands for a specific legal or organizational procedure, the authorizing entity would be defined by the organization's policies or legal requirements pertinent to that procedure.