Which IPS signature regular expression CLI command matches a host issuing a domain lookup for www.theblock.com?

Which IPS signature regular expression CLI command matches a host issuing a domain lookup for
www.theblock.com?

A.
regex-string (\\x03[Tt][Hh][Ee]\\x05[Bb][Ll][Oo][Cc][Kk])

B.
regex-string (\\x0b[theblock.com])

C.
regex-string (\\x03[the]\\x05[block]0x3[com])

D.
regex-string (\\x03[T][H][E]\\x05[B][L][O][C][K]\\x03[.][C][O][M]