Which of the following need not necessarily be saved on a Context Switch…

During a context switch, the operating system saves essential CPU state information such as general-purpose registers, program counter, and stack pointer into the Process Control Block (PCB) to ensure accurate resumption. However, the Translation Look-aside Buffer (TLB) is a hardware cache used for virtual-to-physical address translation. When switching between processes with different address spaces, the TLB entries are typically flushed rather than saved and restored. Therefore, the TLB does not need to be explicitly saved during a context switch.