For each of the following internal controls, indicate the type of control activity and the relevant assertions

\begin{tabular}{|l|} \hline Internal Control \\ \hline \begin{tabular}{l} 1. Sales invoices are matched with shipping documents \\ by the computer system, and an exception report is \\ generated. \end{tabular} \\ \hline \begin{tabular}{l} 2. Receiving reports are prenumbered and accounted for \\ on a daily basis. \end{tabular} \\ \hline \begin{tabular}{l} 3. Sales invoices are independently verified before being \\ sent to customers. \end{tabular} \\ \hline \begin{tabular}{l} 4. Payments by cheque are received in the mail by the \\ receptionist, who lists the cheques and restrictively \\ endorses them. \end{tabular} \\ \hline \begin{tabular}{l} 5. Labour hours for payroll are reviewed for reasonable- \\ ness by the computer system. \end{tabular} \\ \hline \begin{tabular}{l} 6. Cheques are signed by the company president, who \\ compares the cheques with the underlying support- \\ ing documents. \end{tabular} \\ \hline \begin{tabular}{l} 7. Unmatched shipping documents are accounted for on \\ a daily basis. \end{tabular} \\ \hline \begin{tabular}{l} 8. The computer system verifies that all payroll payments \\ have a valid employee identification number \\ assigned by the human resources department at \\ the time of hiring. \end{tabular} \\ \hline \begin{tabular}{l} 9. The accounts receivable master file is reconciled to the \\ general ledger on a monthly basis. \end{tabular} \\ \hline \end{tabular}