Contrast the following terms (you will have to use what you learned in the object-oriented sections of Chapters 7 and 8 to contrast all of these terms):

a. Actor; use case

b. Extends relationship; uses relationship

c. Object class; object

d. Attribute; operation

e. Operation; method

f. Query operation; update operation

g. Abstract class; concrete class

h. Class diagram; object diagram

i. Association; aggregation

j. Generalization; aggregation

k. Aggregation; composition

l. Generic sequence diagram; instance sequence diagram

m. Synchronous message; asynchronous message

n. Sequence diagram; activity diagram