Long description

There are two parts to the image. Part (a): It is labeled as Legend. There are two levels to this part. Level 1: A square block labeled Object with a backward arrow labeled Read pointing to a circle labeled Process. Level 2: A circle labeled Process with a forward dashed arrow labeled Write pointing to a square block labeled Object. Part (b): It is labeled Security level. There are five levels to this part and start from bottom to top. Level 1: There are two horizontal lines between which a square block is labeled 1 with a forward arrow pointing to a circle labeled A. There is a dashed backward arrow from A to 1. Level 2: A circle labeled B with a dashed forward arrow pointing to a square labeled 2. A backward arrow from 2 pointing to B. From level 1, an upward arrow from 1 point to B. From A, a dashed upward arrow points to 2. Level 3: A horizontal line is placed above this level. A square labeled 3 with a forward arrow points to a circle labeled C. C with a dashed forward arrow points to a square labeled 4. 4 with a forward arrow pointing to a circle labeled D. From D, a dashed backward arrow points to 4. From 4, a backward arrow points to C. From C, a dashed backward arrow points to 3. From level 2, a dashed upward arrow from B points to 3. An upward arrow from 2 points to C. From level 1, an upward arrow from A points to 4. Level 4: There are two horizontal lines in between a square labeled 5 with a forward arrow pointing to E. From E, a dashed forward arrow points to 6. A backward arrow from 6 points to E. A dashed backward arrow from E points to 5. From level 3, a dashed upward arrow from C points to 5. Another dashed upward arrow from D points to 6.