An analyst is using the SIEM platform and must extract a custom property from a Cisco device and capture the phrase, “File: Clean.” Which regex must the analyst import?

An analyst is using the SIEM platform and must extract a custom property from a Cisco device and capture the phrase, “File: Clean.” Which regex must the analyst import?
A. File: Clean
B. ^Parent File Clean$
C. File: Clean (.*)
D. ^File: Clean$