Specify the commands that will accomplish the tasks specified below in the indicated order. Do not abbreviate commands.

A$)$ Access the vlan $1$ switch virtual interface $($SVI$).$ B$)$ Set IP address $172\mathrm{.}16\mathrm{.}1\mathrm{.}1/24.$ C$)$ Activate the interface. D$)$ Exit the interface to return to the mode immediately "above" the current mode.