Refer to the exhibit. Which action do the switches take on the trunk link?

Refer to the exhibit. Which action do the switches take on the trunk link?

A. The trunk does not form, and the ports go into an err-disabled status. B. The trunk forms, but the mismatched native VLANs are merged into a single broadcast domain. C. The trunk forms, but VLAN 99 and VLAN 999 are in a shutdown state. D. The trunk does not form, but VLAN 99 and VLAN 999 are allowed to traverse the link.