T/F and Multiple choice

Can you help me understand this Computer Science question?

System Analysis and Design

1.A data flow diagram must have at least one process.

a.True

b.False

2.Which of following regarding a data flow diagram correct?

a.A process must have both an input and output data flow.

b.A data store must be connected to at least one process.

c.External entities should not be connected to one another.

d.All of the Above.

3.The acronym CRUD (create, read, update, and delete) is often used for.

a.True

b.False

4.A context level data flow diagram is also known as a level 1 diagram.

a.True

b.False

5.A process is depicted by a rounded rectangle in a data flow diagram.

a.True

b.False