Under Basel $3,$ total regulatory capital now includes $[$I$]$ Tier $1$ capital, $[$II$]$ Capital conservation buffer, $[$III$]$ Countercyclical capital buffer, and $[$IV$]$ additional capital for systemically important banks.

options:

$1)$ I, II only

$2)$ II and IV only

$3)$ II$,$ III, IV only

$4)$ All are included