Algebraically, the consumption function is represented as $\_\_\_\_\_\_\_\_.$

Group of answer choices

C $=$ a $+$ MPC$*$Y$,$ where a is autonomous consumption $($the amount of consumption expenditure when Y $=0),$ MPC is the marginal propensity to consume, and Y is national income

Y $=$ a $+$ MPC$*$C where a is autonomous consumption $($the amount of consumption expenditure when Y $=0),$ MPC is the marginal propensity to consume, and Y is national income

C $=$ a $+$ MPS$*$Y$,$ where a is autonomous consumption $($the amount of consumption expenditure when Y $=0),$ MPS is the marginal propensity to save, and Y is national income.

MPC $+$ MPS $=1,$ where MPC is the marginal propensity to consume and MPS is the marginal propensity to save.