D is correct. "The router-link switch between the tier-1 router and the tier-0 router is created automatically when you attach the tier-1 router to the tier-0 router. Thus, this switch is labeled as system generated. "
https://docs.vmware.com/en/VMware-NSX-T-Data-Center/3.0/administration/GUID-3F163DEE-1EE6-4D80-BEBF-8D109FDB577C.html
D is correct. "RouterLink is a type of interface that connects Tier-0 and Tier-1 gateways. The interface is created automatically when Tier-0 and Tier-1 gateways are connected. It uses a subnet assigned from the 100.64.0.0/10 IPv4 address space."
Taken from NSX-T 3.0 ICM Lacture Manual
Agree on D - automatically created when Tier-1 is connected with Tier-0 from NSX UI: from page 1240 of https://docs.vmware.com/en/VMware-NSX-T-Data-Center/3.2/nsxt_32_admin.pdf; "If the Tier-1 gateway is connected to a Tier-0 gateway, a router link port is created and its IP address (typically in the 100.64.x.x format) is used to perform the health check for the load balancer service."
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