Final answer:
In context of memory addressing, the legal offset is added to the segment base to produce the physical memory address, which is option 'c'.
Step-by-step explanation:
If the offset is legal in computing, particularly in the context of memory addressing, it is not used as a physical memory address itself. Instead, the correct option is that it is added to the segment base to produce the physical memory address. The segment base represents the start of a segment, and the offset is a value added to this base to find a specific location within the segment. Therefore, the right answer to the question is that the offset is added to the segment base to produce the physical memory address, which is option 'c' among the choices provided.
In computer architecture, memory segmentation is a technique used to divide a computer's primary memory into segments, each having a different purpose or attributes. The segment base is the starting address of the segment, and the offset represents the displacement from the segment base to a specific location within the segment.