Windows LAN Manager (LM) hashes are known to be weak.

Weaknesses of LM hashes include:

A. Passwords are converted to uppercase before hashing.

B. In older Windows systems, LM hashes were transmitted over the network, sometimes in plaintext (or easily intercepted).

D. Passwords are split into two 7-character chunks, which are hashed independently, reducing entropy.

From CEH v13 Courseware:

Module 6: Malware and Password Threats

Module 4: Windows Enumeration

Incorrect Option:

C: LM uses DES encryption with 56-bit keys (not 32-bit).