C:
BPDU Guard feature protects the port from receiving STP BPDUs, however the port can transmit STP BPDUs. When a STP BPDU is received on a BPDU Guard enabled port, the port is shutdown and the state of the port changes to ErrDis (Error-Disable) state.
BPDU guard is enabled only on access ports where laptops, servers or other device are connected. If some one generate PBDU's from end devices PBDU guard will put the port in to erro-disable state
Ref: What is BPDU Guard and How to Configure BPDU Guard? - GeeksforGeeks
"...
BPDU Guard
BPDU Guard is a feature that defends the Layer 2 Spanning Tree Protocol (STP) topology against BPDU-related threats and is designed to protect the switching network. The BPDU guard feature must be activated on ports that should not receive BPDUs from connected devices.
...
In Global configuration mode, the BPDU Guard feature can be enabled globally, or per interface in Interface configuration mode. The port gets disabled and the port status is set to Errdisable (same as shutdown status) whenever a BPDU Guard enabled port gets a BPDU from the linked device.
...."
C is correct.
"Spanning tree shuts down STP ports that are in a Port Fast-operational state if any BPDU is received on those ports. In a valid configuration, Port Fast-enabled STP ports do not receive BPDUs. Receiving a BPDU on a Port Fast-enabled port signals an invalid configuration, such as the connection of an unauthorized device, and the BPDU guard feature puts the interface in the error-disabled state."
https://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/trash/swstpopt.html#wp1095752
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