Alice sends an email to Bob via webmail. Bob receives it via webmail. Indicate the minimum number possible of TCP connections necessary for the sending and receiving Alice's e-mail to Bob. 3 4 6 1 0 Which of the following is true of Go-Back-N protocols? (Check all that apply.) The sender is allowed to transmit up to N packets (when available) without waiting for an acknowledgment. The sender and the receiver both "stop and wait." Use cumulative acknowledgments. Use only individual acknowledgments. All these answers