a$.$ LO $8\mathrm{.}2$ When an online real$-$time $($OLRT$)$ IT processing system is in use, internal control can be strengthened by:

$(1)$ Providing for the separation of duties between data input and error handling operations.

$(2)$ Reconciling hash totals to computer runs.

$(3)$ Use of authentication procedures before a user can obtain access to the computer files.

$(4)$ Preparing batch totals to provide assurance that file updates are made for the entire input.