On June 1, 2020, Destiny Ltd. received $3,600 for services to be performed evenly over the next twelve months. The adjusting entry on December 31, 2020, would include a: 1) debit to Service Revenue for $1,800 2) credit to Service Revenue for $1,800 O3) debit to Unearned Service Revenue for $1,800 4) debit to Unearned Service Revenue for $2,100