Given the forecast, booked orders and master production schedule shown in the table below, and a beginning inventory of $0,$ what is the available to promise inventory for period $4?$

Period

$1$

$2$

$3$

$4$

Forecasted Demand

$100$

$100$

$90$

$90$

Booked Orders

$103$

$87$

$54$

$21$

Projected ending inventory

Master production schedule

$103$

$100$

$95$

$100$

Available to Promise

$0$

Question $28$ options:

$54$

$100$

$79$

$10$