your company uses DHCP to lease IPv4 addresses to computers at the main office. A WAN link connects the main office to a branch office. All computers in the branch office are configured with static ip addresses. The branch office does not use DHCP and uses a different subnet. You need to ensure that the portable computers can connect to network resources at the main office and the branch office. How should you configure each portable computer?（）

• A、Use a static IPv4 address in the range used at the branch office.
• B、Use a alternate configuration that contains a static IP address in the range used at the main office.
• C、Use the address that was assigned by DHCP as a static IP address.
• D、Use an altermate configuration that contains a static IP address in the range used at the branch office.