The definition of beginning annuity is as follows

A、Beginning annuity is a series of cash flows. Beginning annuity is also called annuity due.;
B、Beginning annuity is a series of equal cash flows. Beginning annuity is also called annuity due.;
C、Beginning annuity is a series of equal cash flows occurring at the beginning of every period. Beginning annuity is also called annuity due.;
D、Beginning annuity is a series of cash flows occurring at the beginning of every period. Beginning annuity is also called annuity due.