In Tor, a sequence of routers is set up by the sender$.$ The sequence looks like this: Sender $->$ Router #$1->$ Router #$4->$ Router #$6->$ Receiver

Which one of the following is true:

Group of answer choices

Router #$6$ knows the Receiver.

Router #$6$ knows the Sender.

Router #$6$ knows Router #$1.$

Router #$6$ knows nobody.