Select $3$ advantages of virtual circuits relative to a datagram service model?

Choice $1$ of $6$:Virtual circuits require less setup than datagrams

Choice $2$ of $6$:Virtual circuit identifiers can be used as a direct index instead of an indirect key to forwarding tables

Choice $3$ of $6$:Virtual circuits can have lower per$-$packet overheads

Choice $4$ of $6$:It is easier to mask failures with virtual circuits

Choice $5$ of $6$:Routing only needs to happen once per$-$flow instead of per$-$packet

Choice $6$ of $6$:Virtual circuits require routers to hold state for every connection