Which virus type remains permanently in memory during an entire work session, even after the target host's program is executed and terminated?

Which virus type remains permanently in memory during an entire work session, even after the target host's program is executed and terminated?

• A. TSR virus
• B. Transient virus
• C. Intrusive viruses
• D. Worms

Answer: (A)

This question tests the idea of memory-resident malware. A terminate-and-stay-resident (TSR) virus loads into memory and then stays there after the host program finishes. By remaining active in RAM for the entire work session, it can monitor what the user does and intercept or infect other programs as they are loaded, until the system is rebooted or memory is cleared. That persistence in memory after the host app ends is the hallmark of a TSR. Transient viruses, in contrast, do not linger in memory once the host program exits; they act only while the host is running. Intrusive isn’t a standard term tied to this specific behavior, and worms focus on self-propagation across networks rather than remaining resident in a single host’s memory for the duration of a session.

This question tests the idea of memory-resident malware. A terminate-and-stay-resident (TSR) virus loads into memory and then stays there after the host program finishes. By remaining active in RAM for the entire work session, it can monitor what the user does and intercept or infect other programs as they are loaded, until the system is rebooted or memory is cleared. That persistence in memory after the host app ends is the hallmark of a TSR.

Transient viruses, in contrast, do not linger in memory once the host program exits; they act only while the host is running. Intrusive isn’t a standard term tied to this specific behavior, and worms focus on self-propagation across networks rather than remaining resident in a single host’s memory for the duration of a session.