Six hosts with MAC address A$1-$A$6$ are connected to an Ethernet LAN through transparent switches S$1$ and S$2$ and a WAP as shown below.

Switch diagram

Swich S$1$ and Switch S$2$ have built switching tables as shown below.

Switch S$1$

Switch S$2$

A$1,1$

A$1,1$

A$2,3$

A$2,1$

A$3,2$

A$3,1$

A$4,2$

A$4,1$

A$5,4$

A$5,3$

A$6,4$

A$6,2$

A$4$ transmits a frame to A$3.$ What happens next

Question $37$ options:

S$1$ confirms switching table entry is $($A$4,2)$ and forwards frame on ports $1,3$ and $4,$ S$2$ filters the frame.

S$1$ confirms switching table entry is $($A$4,2)$ and filters frame. Frame does not reach S$2.$

S$1$ confirms switching table entry is $($A$4,2)$ and forwards frame on ports $1,3$ and $4,$ S$2$ confirms switching table entry is $($A$4,1)$ and forward frame back to S$1.$

S$1$ confirms switching table entry is $($A$4,2)$ and forwards frame back to WAP.