Answer
a. Case diagram
b. Class diagram
c. Sequence diagram
Work Step by Step
a. Represents the way in which users will interact with the system - Use case diagram (Use case diagrams show the interactions between users (actors) and the system, focusing on functionality and user goals.)
b. Represents the relationship between classes in the system - Class diagram (Class diagrams model the structure of the system — including classes, their attributes, methods, and relationships (associations, inheritance, etc.).)
c. Represents the manner in which objects will interact to accomplish a task - Sequence diagram (Sequence diagrams show object interactions over time, illustrating how messages are passed between objects to complete a process or use case.)
