Which of the following is NOT true regarding annual deductibles?

A$.$ Claims filed within a specified time of the current plan year for expenses incurred in the previous plan year may still apply to the previous year's deductible.

B$.$ Coinsurance begins after the annual deductible is met.

C$.$ Once the annual deductible is met in a calendar year, it does not have to be met in subsequent years.

D$.$ They generally must be met by covered charges incurred in one calendar year.