Which key length options are available in AES encryption?

The correct answer is based on the established standards for the Advanced Encryption Standard (AES) encryption algorithm. AES is a symmetric key encryption method that is widely used for securing data. The key lengths that AES supports include 128 bits, 192 bits, and 256 bits, which correspond to different levels of security.

Using a longer key length increases the complexity and time required for brute-force attacks, thereby enhancing security. Each of the three key lengths offers varying levels of encryption strength, with 128 bits being the minimum recommended length for secure applications, and 256 bits providing a higher security margin for more sensitive data.

The other options listed do not correspond to the key lengths defined by the AES standard. For example, the inclusion of 32 or 64 bits in the other choices does not align with AES specifications, as they are shorter than the required minimum. Thus, option B is the accurate representation of the key lengths allowed in AES encryption, validating its selection as the correct answer.