What is the difference between system integration testing and acceptance testing?

What is the difference between system integration testing and acceptance testing?
A . System integration testing is testing non-functional requirements. Acceptance testing concentrates on the functionality of the system.
B . System integration testing is executed by the developers. Acceptance testing is done by the customer.
C . System integration testing verifies that a system interfaces correctly with other systems. Acceptance testing verifies compliance to requirements.
D . System integration testing verifies compliance to requirements. Acceptance testing verifies correct interaction with other systems existing in the user’s environment.

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Answer: C