What is the difference between least privilege and need-to-know?

A.
A user should have least privileges that restrict her need-to-know.

B.
A user should have a security clearance to access resources, a need-to-know about those resources, and least privilege to give her full control of all resources.

C.
A user should have a need-to-know to access particular resources; least privilege should be implemented to ensure she only accesses the resources she has a need-to-know.

D.
They are two terms for the same issue.

Explanation:
Users should only be able to access the resources they need to fulfill
their duties of their positions. They also should only have the level of permissions
and rights for those resources that is required to carry out the exact operations
they need for their jobs and no more. This second concept is more granular than the
first, but they have a symbiotic relationship.