A switch is configured with the snmp$-$server community Cisco RO command running SNMPv$2$c$.$ An NMS is trying to communicate to this router via SNMP$.$ What can be performed by the NMS$?($Choose two.$)$

$1.$

The NMS can graph obtained results and change the hostname of the router.

$2.$

The NMS can only change the hostname of the router.

$3.$

The NMS can use GETBULK and return many results.

$4.$

The NMS can only graph obtained results.