How many SGTs can be used per IP subnet?

Up to two SGTs in an SGT stack; one for the VLAN and one for the IP Prefix

Up to two SGTs in an SGT stack; one for the IP Prefix and one for the QoS mappings

In theory, up to the maximum number of supported SGT$$s in the environment $-$ the number of assigned SGTs is decoupled from any OSI Model constructs

Up to two SGTs in an SGT stack; one for the IP Prefix and one for the SGTEP$-$ID $($Security Group Tunnel Endpoint router ID$)$