题目内容：
根据下列材料，回答题：In the following essay，each blank has four choices.Choose the most suitable one from the four choices and write down in the answer sheet.
The key to SNMP（ 1 ）is its simplicity.It has a small command set that does a good job of collecting information from（ 2 ）any network device.In a SNMP environment，（ 3 ）of the work is handled by the network management system.Devices that are being managed are not（ 4 ）with processing（ 5 ）that might affect their performance.
请选择（ 1 ）处最佳答案：
参考答案：
答案解析：