An administrator is upgrading memory on the server. Once the server in turned back on, the administrator notices that the memory has not changed. The system board website says the board should accept the new amount of memory.Which of the following should the administrator do FIRST?（）

• A、Replace memory chips with known good memory chips.
• B、Reseat the memory chips.
• C、Update the BIOS.
• D、Upgrade the server OS