How Is a Boolean Variable Declared in a Program

Multiple Choice

How is a Boolean variable declared in a program?

A) A char type variable must be declared, optionally followed by a bool value.
B) A bool type variable must be declared, optionally followed by a bool value.
C) An int type variable must be declared, optionally followed by a bool value.
D) A boolean type variable must be declared, optionally followed by a bool value.