19) Which is the number system based on two finite choices, such as "ON" and "OFF" light switches?

	a.	none of the listed choices
	b.	hexadecimal
	c.	octal
	d.	binary
	e.	decimal

21) Which is not true of SSDs (solid state drives) ?

	a.	none of the listed choices
	b.	more expensive per GB than hard disk drives
	c.	many moving parts
	d.	resistant to shock/damage
	e.	lightweight

28) What is a consolidation (3-D) reference?

	a.	A data cube function
	b.	A reference to multiple cells
	c.	A circular reference to the cell
	d.	None of the listed choices
	e.	A cell reference to another worksheet