Which of the following is the definition of M$2?$

The definition of M $2$ is

A$.$ the total value of currency plus transactions deposits plus non$-$bank traveler's'checks.

B$.$ M$1$ plus savings and small time deposits, retail money market mutual funds, and money market deposit accounts.

C$.$ currency plus transactions deposits plus all other time deposits and mutual fund accounts, regardless of size or origin.

D$.$ M$1$ plus all deposits with no set maturity.