Long description

Part (a): The block is divided into six segments. The first and second segments, and the fourth and fifth segments from the top are divided by a dashed line. An arrow points upward from the dashed line. The third segment from the top is shaded. The second, fifth and sixth segments are labeled A, B, and Operating system, respectively. The first and fourth segments are marked room for growth while the second and fifth segments are marked actually in use.

Part b: The block is divided into 10 segments. The first and second, second and third, sixth and seventh, seventh and eighth segments are divided by a dashed line. Two arrows point toward each other in the second and seventh segment. The segments are labeled from top to bottom as follows: B stack, room for growth, B data, B program, blank, A stack, room for growth, A data, A program, Operating system. The fifth segment is shaded.