What is true about certificates of deposit?

They offer lower interest rates than savings account.

They are the most liquid account available.

The money has to remain in the account for a specified period of time.

All of the above are true.

I would say "The money has to remain in the account for a specified period of time." Because banks can choose to compound rates in a monthly, quarterly, or yearly. And they reward you for putting money in their bank for a certain amount of time