8 of 17 ABC firm has received $2,400 for services to be provided during the year. If you know that the firm has provided $1,000 worth of services, what is the required adjusting entry during the year O Dr. Unearned revenues 1,400 Cr. Service revenues 1-400 O Dr. Service revenues 1,400 Cr. Unearned revenues 1,400 1,000 O Dr. Service revenue Cr. Unearned revenue 1,000 1,000 O Dr. Unearned revenues Cr. Revenues 1.000