What happens when a program is reset?

When a program is reset, the block pointer is indeed set back to the first executable line of the program. This means that all data and execution state pertaining to the program's progress are cleared, allowing the program to start from the beginning. This function is crucial in programming and control systems, as it enables a fresh run of the program, ensuring that any lingering states or outputs from previous executions do not interfere with the current run. By grounding the execution state in the initial position, it guarantees that the program will operate under the same conditions as during its initial execution.

The other options, while potentially relevant in different contexts, do not accurately describe the standard behavior of a program reset. For example, terminating the program or stopping all active processes does not align with the routine and functional design of resetting a program, which is designed to restart execution rather than terminate or halt operations outright.