Answer:
C). private members
Step-by-step explanation:
These are options
a. constructor functions
b. static members
c. private members
d. public members
Protected members can be regarded as member that accessibility of them from outside the class is zero, they can only get accessibility from derived classes, though this is not applicable to private class. It should be noted that Protected members of a base class are like private but they may be accessed by derived classes.