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Classify the following adjusting entries as involving prepaid expenses, unearned revenues, accrued expenses, or accrued revenues. \begin{tabular}{l} \hline a. To record revenue earned that was previously received as cash in advance. \\ \hline b. To record wages expense incurred but not yet paid or recorded. \\ \hline c. To record revenue earned but not yet billed or recorded. \\ \hline d. To record expiration of prepaid insurance. \\ \hline e. To record annual depreciation expense. \\ \hline \end{tabular}