Answer:
c. Accrue revenue by making an adjusting entry at the end of the period
Explanation:
As in the given situation since it is mentioned that the service is earned but not yet billed or collected so here the revenue is accrued so that the revenue could be recorded by recording the adjusting entry and there is an account receivable at the closing of the period.
Therefore according to the given options, the option c is correct and the same is to be considered