Which command would you use to assign an IP address to an SVI?

To assign an IP address to a Switched Virtual Interface (SVI), the appropriate command is "ip address x.x.x.x". This command is used in the interface configuration mode of a Cisco device. When configuring an SVI, this command enables the interface and specifies the IP address along with the subnet mask for that virtual interface.

In more detail, when you're in interface configuration mode for the SVI, entering the "ip address" command sets the IP address that will be associated with that particular VLAN interface. This is essential for the SVI to participate in Layer 3 routing and to allow devices in its VLAN to communicate with devices on other networks.

The other choices either do not conform to the syntax used in Cisco's IOS or represent nonexistent commands, making them unsuitable for this configuration task. Therefore, "ip address x.x.x.x" is the correct and only viable command to assign an IP address to an SVI.