Which statement describes the question mark wildcard character in a SIP trigger that is configured on Cisco Unity Express?

Which statement describes the question mark wildcard character in a SIP trigger that is configured
on Cisco Unity Express?

A.
It matches any single digit in the range 0 through 9.

B.
It matches one or more digits in the range 0 through 9.

C.
It matches zero or more occurrences of the preceding digit or wildcard value.

D.
It matches one or more occurrences of the preceding digit or wildcard value.

E.
It matches any single digit in the range 0 through 9, when used within square brackets.

Explanation:
Table 5-2 Trigger Pattern Wildcards and Special Characters
Character
Description
Examples
X
The X wildcard matches any single digit in the range 0 through 9.
The trigger pattern 9XXX matches all numbers in the range 9000 through 9999.
!
The exclamation point (!) wildcard matches one or more digits in the range 0 through 9.
The trigger pattern 91! matches all numbers in the range 910 through
91999999999999999999999999999999.
?
The question mark (?) wildcard matches zero or more occurrences of the preceding digit or
wildcard value.
The trigger pattern 91X? matches all numbers in the range 91 through
91999999999999999999999999999999.
+
The plus sign (+) wildcard matches one or more occurrences of the preceding digit or wildcard
value.
The trigger pattern 91X+ matches all numbers in the range 910 through
91999999999999999999999999999999.
[ ]
The square bracket ([ ]) characters enclose a range of values.
The trigger pattern 813510[012345] matches all numbers in the range 8135100 through 8135105.
-The hyphen (-) character, used with the square brackets, denotes a range of values.
The trigger pattern 813510[0-5] matches all numbers in the range 8135100 through 8135105.
^
The circumflex (^) character, used with the square brackets, negates a range of values. Ensure
that it is the first character following the opening bracket ([).
Each trigger pattern can have only one ^ character.
The trigger pattern 813510[^0-5] matches all numbers in the range 8135106