Consider a path consisting of three nodes: A$,$ B$,$ C in a packet switched network. The transmission speed of link $($A$,$B$)$ is s$1$ bps$,$ and the transmission speed of link $($B$,$C$)$ is s$2$ bps$.$ The propagation delays of both links are d seconds. Packet sizes are p bits. Node A sends two packets back$-$to$-$back at times t$1$ and t$2$ to node B$.$ That is$,$ t$2=$ t$1+$ p$/$s$1.$

What is the condition that the $1$st packet on node B has been delivered to node C before the arrival of the $2$nd packet ont node B$?($in other words, the $2$nd packet does not experience any queueing delay on node B$)$

Question $9$ options:

None of the above

s$1<=$ s$2$

s$1=$ s$2$

s$1>$ s$2$