In which two locations in an enterprise network can an IPS sensor be placed？（）

• A、bridging VLANs on two switches
• B、bridging two VLANs on one switch
• C、between two Layer 2 devices with trunking
• D、between two Layer 2 devices without trunking
• E、between a Layer 2 device and a Layer 3 device with trunking