What Is the Purpose of a Get-Out-Of-Jail-Free Card in a Pen

What is the purpose of a Get-Out-of-Jail-Free card in a pen testing engagement?

A) It indemnifies the tester against any loss or damage that may result from the testing
B) It details standards and penalties imposed by federal, state, or local governments
C) It is a formal approval to start pen test engagement
D) It gives an understanding of the limitations, constraints, liabilities, and indemnification considerations