Which of the following statements about hybrid interfaces is true?

A hybrid interface on a Huawei switch is highly flexible. It can be configured to send frames for specific VLANs with their 802.1Q tags intact (port hybrid tagged vlan ...) and to send frames for other VLANs without tags (port hybrid untagged vlan ...). Therefore, a hybrid interface can indeed remove VLAN tags from some outgoing frames (those belonging to the untagged set) while preserving tags for others. This allows it to connect to both user devices (which expect untagged frames) and other network devices like switches or IP phones (which may expect tagged frames).

B. All switch ports, including hybrid ports, have a PVID. The PVID is essential for processing incoming untagged frames and defaults to 1 if not explicitly set.
C. This is incorrect. A key feature of a hybrid port is its ability to send frames for specified VLANs as untagged.
D. This is incorrect. A hybrid port can receive both tagged and untagged frames. It processes incoming untagged frames by assigning them to its PVID.

1. Huawei Enterprise Networking Documentation, "S Series Switches Configuration Guide - VLAN," Section: "Interface Types." This guide explicitly states that a hybrid interface can be a member of multiple VLANs and can send frames for some VLANs tagged and for others untagged.

2. Huawei HedEx Documentation for VRP, "VLAN Configuration," Module: "Configuring a Hybrid Interface." The documentation details the processing of ingress and egress frames, stating: "When an interface sends a frame, if the VLAN ID of the frame is in the untagged VLAN list of the interface, the interface removes the VLAN tag and then sends the frame." This directly supports the correct answer.