टी.एस.आर प्रोग्राम म्हणजे काय ?

The correct answer is Option C (Terminate and Stay Resident those programs that actually stay in memory after execution.).

Key Points:
• Operating System architecture in classic DOS and systems programming:
• Full Form and Definition: TSR stands for Terminate and Stay Resident.
• Working Mechanism: In MS-DOS environments, when a regular application finishes execution, it terminates and frees its allocated RAM. In contrast, a TSR program relinquishes execution back to the OS command shell, but remains resident in primary memory (RAM).
• ⌨ Functionality: TSR programs attach themselves to hardware or software interrupt vectors (such as keyboard or timer interrupts). They remain dormant in memory until activated by a designated "hotkey" or hardware event (e.g., print spoolers, mouse drivers, and clock displays), allowing pseudo-multitasking on single-tasking operating systems.
• Correct option is Terminate and Stay Resident (Option 3).
• Key Takeaway: TSR (Terminate and Stay Resident) programs return control to DOS while remaining active in primary memory for hotkey activation.