April's forecast was $2,000$ units and $1,900$ were actually demanded. Use a simple moving average to calculate and provide May's forecast number. $($To aid in solving the May forecast, $3$ formula options to choose from have been provided below$)$

Formula option $1$:

$F_t=\frac{A_{t-1}+A_{t-2}+A_{t-3}+\text{d}\text{o}\text{t}\text{s}+A_{t-n}}{n}$

Formula option $2$:

$F_t=w_1{A}_{t-1}+w_2{A}_{t-2}+w_3{A}_{t-3}+$dots$+w_n{A}_{t-n}$

Formula option $3$:

$F_t=F_{t-1}+(A_{t-1}-F_{t-1})$