Options B and D are the correct components that should be checked when a Cisco Nexus 9000 Series Switch fails to boot using POAP (Power On Auto Provisioning). POAP requires a DHCP server to bootstrap IP information for the switch, and a TFTP server that contains the configuration script and the image file for the switch. The other options are either irrelevant or incorrect for POAP. References: * Cisco Nexus 9000 Series NX-OS Fundamentals Configuration Guide, Release 9.3(x) - Configuring Power On Auto Provisioning [Cisco Nexus 9000 Series Switches], Configuring Power On Auto Provisioning, POAP Overview * Cisco Nexus 9000 Series NX-OS Fundamentals Configuration Guide, Release 9.3(x) - Configuring Power On Auto Provisioning [Cisco Nexus 9000 Series Switches], Configuring Power On Auto Provisioning, POAP Process