A server administrator is reporting performance issues when accessing all internal resources. Upon further investigation, the security team notices the following: · A user’s endpoint has been compromised and is broadcasting its MAC as the default gateway’s MAC throughout the LAN. · traffic to and from that endpoint is significantly greater than all other similar endpoints on the LAN. · Network ports on the LAN are not properly configured. · Wired traffic is not being encrypted properly. Which of the following attacks is most likely occurring?