In which two ways are IEEE STP BPDUs forwarded if VLAN 99 is configured as native? (Choose two.)

In which two ways are IEEE STP BPDUs forwarded if VLAN 99 is configured as native? (Choose two.)
A . VLAN 1 STP BPDU tagged through VLAN 1
B . VLAN 1 STP BPDU untagged through VLAN 1
C . VLAN 1 STP BPDU tagged through VLAN 99
D . VLAN 1 STP BPDU untagged through VLAN 99
E . VLAN 1 STP BPDU tagged through VLAN 1 and 99
F . VLAN 1 STP BPDU untagged through VLAN 1 and 99

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Answer: AD