Which is the best definition of complete testing..?

Fault Masking is:

The flow graph below shows the logic of a program for which 100% statement coverage and 100% decision coverage is required on exit from component testing.
The following test cases have been run:
Test Case 1 covering path P,Q,R,U
Test Case 2 covering path P,Q,S,V
Test Case 3 covering path P,Q,S,W,X
Test case 4 covering path P,Q,S,W,Y
Refer to the exhibit

Which TWO of the review types below are the BEST fitted (most adequate) options to choose for reviewing safety critical components in a software project? Select 2 options.

Test objectives for systems testing of a safety critical system include completion of all outstanding defect correction. Regression testing is required following defect correction at all test levels. Which TWO of the following metrics would be MOST suitable for determining whether the test objective has been met?
a. Regression tests run and passed in systems testing
b. Incidents closed in systems testing
c. Planned tests run and passed in system testing
d. Planned tests run and passed at all levels of testing
e. Incidents raised and closed at all levels of testing