You are the network administrator of a Layer 3 switched network. Users in one VLAN are complaining thataccess to the server VLAN is very slow from time to time. Traffic in the local VLAN works without any issue，and users in other VLANs do not have any complaint to reach the server VLAN. What is most likely thecause of this issue？（）

• A、routing issue
• B、denial-of-service attack
• C、MAC flooding
• D、spanning-tree recalculation
• E、Layer 2 loop
• F、ARP spoofing attack