Strongman's Gym gains a client who prepays $630 for a package of six physical training sessions. Strongman's Gym collects the $630 in advance and will provide the training later. After four training sessions, what should Strongman's Gym report on its income statement assuming it uses the accrual basis accounting method? O A. Unearned service revenue of $420 B. Cash of $210 C. Service revenue of $420 OD. Service revenue of $630