The exponential smoothing forecast for period

t $+1$

is a weighted average of which of the following?

the actual value in period

t $+1$

with weight $$ and the forecast for period t with weight

$1$

the forecast value in period

t $1$

with weight $$ and the forecast for period t with weight

$1$

the actual value in period t with weight $$ and the forecast for period t with weight

$1$

the forecast value in period t with weight $$ and the actual value for period t with weight

$1$