The correct answer is C. D*m??.
A. $45* is a valid search criteria. It will match documents that contain the word “45” or the word “45” followed by any number of characters.
B. cal is a valid search criteria. It will match documents that contain the word “cal” or the word “cal” followed by any number of characters.
C. Dm?? is an invalid search criteria. It will not match any documents. The asterisk () is a wildcard character that can match any number of characters, but the question mark (?) is a wildcard character that can match any single character. Therefore, the search criteria D*m?? will match documents that contain the word “D” followed by any number of characters, followed by the letter “m” followed by any single character. However, there are no documents that meet this criteria.
D. AS150* is a valid search criteria. It will match documents that contain the word “AS150” or the word “AS150” followed by any number of characters.