Two assumptions in the basic Order$-$Reorder$-$Replenishment Inventory cycle are that

$($a$)$ the production is not instantaneous, and

$($b$)$ the inventory builds up over time.

Group of answer choices

Both $($a$)$ and $($b$)$ are true.

Both $($a$)$ and $($b$)$ are false.

$($a$)$ is true, while $($b$)$ is false.

$($a$)$ is false, while $($b$)$ is true.