Which of the following statements about named constants is$/$are true?

Question $8$ options:

A named constant must be initialized with a value at the time it is declared.

The identifier name of a named constant can only contain capital letters and underscores.

The initial value of a named constant, cannot be changed during the program execution.

All $3$ of the above statements are true.

Statements A and C are true, but B is not.