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Final answer:An SNMP agent can send Response messages to reply to queries from an SNMP manager. It reacts to GetRequest and SetRequest messages, but it does not initiate them. So, the correct option is A.Explanation:An SNMP agent can send various types of messages as part of the Simple Network Management Protocol operations. However, among the options provided, the correct answer is a) Response. An SNMP agent primarily sends Response messages in reply to GetRequest, SetRequest, and GetNextRequest messages initiated by an SNMP manager. It is the manager’s role to issue GetRequest and SetRequest messages to the agent in order to retrieve information from or configure the managed devices.The Response message is used to carry the requested information back to the manager or to acknowledge the receipt and processing of a SetRequest. Although an SNMP agent may generate and send additional message types, such as Trap or Inform messages to notify of certain events, it does not send GetRequest or SetRequest messages, which is the function of the SNMP manager....