App Corporation received $2,000 on March 1st for services expected to be completed by June 31st. On the March 31st trial balance the Unearned Service Revenue account has a balance of $2,000. After evaluation, the management of App Corporation has determined that $500 of the $1,000 received on March 1st was earned in March. The correct adjusting entry is? Select one: Oa. Dr.Service Revenue $2,000. Cr.Unearned Service Revenue $2,000. O b. Dr.Service Revenue $500. Cr.Unearned Service Revenue $500. O c. Dr.Unearned Service Revenue $2,000. Cr.Service Revenue $2,000 O d. Dr.Unearned Service Revenue $500. Cr.Service Revenue $500.