Which statement describes the question mark wildcard character in a SIP trigger that is configured on Cisco Unity Express?
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A. B. C. D. E.C.
In the context of a SIP trigger configured on Cisco Unity Express, the question mark wildcard character (?), also known as the single-character wildcard, is used to match a single character or digit in the specified range.
The correct answer to this question is A. The question mark wildcard character matches any single digit in the range 0 through 9. Therefore, if a SIP trigger is configured with the pattern 5551???, it will match any number that starts with 5551 and has three additional digits at the end, regardless of what those digits are.
Answer B, which suggests that the question mark wildcard matches one or more digits in the range 0 through 9, is incorrect. This answer describes the plus sign (+) wildcard character, which matches one or more occurrences of the preceding digit or wildcard value.
Answer C is incorrect because it describes the asterisk (*) wildcard character, which matches zero or more occurrences of the preceding digit or wildcard value.
Answer D is also incorrect, as it describes the plus sign (+) wildcard character, not the question mark wildcard character.
Answer E is incorrect because it describes the use of the question mark wildcard character within square brackets, which creates a character set and matches any single character in that set.