In the template prefix template what kind of variable is the parameter T? a. T must be a class. b. T must not be a class. c. T can be only types built into the C++ language. d. T can be any type,...

In the template prefix

template

what kind of variable is the parameter T?

a. T must be a class.

b. T must not be a class.

c. T can be only types built into the C++ language.

d. T can be any type, whether built into C++ or defined by the programmer