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

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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.

Answer: B