Final Answer:
The correct option is B) ULT and KLT.
Step-by-step explanation:
ULT (User-Level Threads) and KLT (Kernel-Level Threads) are terms associated with threading models in operating systems. Solaris, being a UNIX-based operating system, supports both ULT and KLT.
Therefore, option B) "ULT and KLT" is the most accurate representation of the terms mentioned in the question.
While Solaris is a specific operating system, the terms ULT and KLT are more directly related to the threading models employed within operating systems.
So the correct option is B) ULT and KLT.