Final answer:
PortFast, UplinkFast, and BackboneFast are Cisco's proprietary extensions to STP, now incorporated into the IEEE standards 802.1D for STP and 802.1w for RSTP, which enables faster convergence of network protocols.
Step-by-step explanation:
The standards that natively include PortFast, UplinkFast, and BackboneFast are features of Cisco's enhancements to the original Spanning Tree Protocol (STP). The correct answer to which standards include these features would be 802.1D & 802.1w.
802.1D refers to the original STP standard, while 802.1w is known as Rapid Spanning Tree Protocol (RSTP), which improves the original protocol by enabling faster convergence.
These features were proprietary extensions developed by Cisco to improve network performance and recovery times. Later, some of these concepts were incorporated into the IEEE's standards, with PortFast being analogous to what's now part of RSTP.