Certified Ethical Hacker (CEH) v13 312-50v13 — Question 142

An ethical hacker is attempting to crack NTLM hashed passwords from a Windows SAM file using a rainbow table attack. He has dumped the on-disk contents of the SAM file successfully and noticed that all LM hashes are blank. Given this scenario, which of the following would be the most likely reason for the blank LM hashes?