The annotation ________ indicates that a private instance variable should be serialized.

End-of-line comments that should be ignored by the compiler are denoted using:

a. Two forward slashes (//). b. Three forward slashes (///). c. A slash and a star (/*). d. A slash and two stars (/**).

How many times will the following loop display "Hello world!"?

for (int i = 0; i < 20; i++) cout << "Hello world!" << endl; a. 20 b. 19 c. 21 d. an infinite number of times