Which statement about the function of the "+" symbol in the E.164 format is true?

Which statement about the function of the “+” symbol in the E.164 format is true?

A.
The “+” symbol represents the international country code.

B.
The “+” symbol represents the international call prefix.

C.
The “+” symbol matches the preceding element one or more times.

D.
The “+” symbol matches the preceding element zero or one time.