Multiple choices: please choose one answer.

1- The object-oriented model ______.

a. has a low system overhead that speeds transactions.

b. has a visual model that yields exceptional conceptual simplicity.

c. has objects that contain all operations that can be performed on it.

d. has a tabular view substantially that improves conceptual simplicity.

2- In an OO data model, a _____ is a collection of similar objects with shared structure (attributes) and behavior (methods).

a. relation.

b. tuple.

c. segment.

d. class