Which of the following is true of other checkable deposits?

a. They are checking account deposits at commercial banks and do not pay any interest.
b. They are accounts at financial institutions that pay interest and give the depositor check-writing privileges.
c. They comprise solely of demand deposits at mutual savings banks.
d. They are not included in the M1 money supply.
e. They are savings deposits that earn interest at savings and loan associations.

b