Accounting · Trial Balance and Suspense Account

During the preparation of the final accounts, the following errors were discovered: 1. A rent payment of $1,200 was recorded as $2,100 in both the rent account and the bank account. 2. A contra entry of $400 between the receivables and payables ledgers was recorded by debiting the payables account and crediting the receivables account for $40. Which of these errors would have required an entry in a suspense account when the trial balance was originally extracted?