What is the packet flow for Kerberos authentication?

TGS$-$REQ $>$ TGS REP $>$ AS$-$REQ $>$ AS$-$REP

TGT$-$REQ $>$ TGT REP $>$ AS$-$REQ $>$ AS$-$REP

AS$-$REQ $>$ AS$-$REP $>$ TGT$-$REQ $>$ TGT REP

AS$-$REQ $>$ AS$-$REP $>$ TGS$-$REQ $>$ TGS REP

None of the above