Correct option is B
A Brown-out reset (BOR) is a crucial protection mechanism in microcontrollers and digital circuits designed to prevent malfunctions when the supply voltage drops below a predefined safe operating threshold. When the voltage drops into this "danger zone" where operation is unreliable, the BOR circuit holds the processor in a reset state until the voltage returns to a safe level, at which point the system restarts safely. This prevents erratic behavior, such as executing incorrect instructions or corrupting memory, which can occur with insufficient voltage.
