E2.2 Create requirements and the ER diagram for a scenario with two entities (both with several attributes) involved E2.2a 1:M relationship, where participation on the 1 E2.2b 1:M relationship, where participation on the 1 in the following relationship: sideoi aarition on the Mside is optional. side is optional and participation on the M side is mandatory E2.2c 1:M relationship, where participation on both sides is mandatory