4. Using the DFD rules listed in the book, identify four errors on the following Level 1 and Level 2 diagrams. List ONLY three! All past three will not be graded. Note: For the purpose of this exercise, disregard the naming conventions for data flows, processes, etc.; do not list this as an error.

1.

2.

3.

Level 0: DS1 SS1 -A1 P1 A A2 A3 A4 P2 -02 SS3 P3 SS2 01 A6 A5 P4 Level 1: 11 P1.1 -B2 P1.2 -B3 -A2 B1 B2 P1.3 A1 A1- P1.4 DS1 L Level 2: -B1 -B3 P1.2.1 C1 P1.2.3 C2 C3 C4 P1.2.2 -A2 -B2 P1.2.4 -A4