2. Stop and Wait ARQ is recommended: a) for links with long distances b) for links with low error probability c) for links with high bit rate d) for links with low bandwidth delay products e) for links with high bandwidth delay products 3. Go-Back-N ARQ is recommended: a) for links with large noise effects b) for links with small distances c) for links with low bandwidth delay products d) for links with low error probability e) for links with high bit rate 4. Stop and wait is equivalent to Go-Back-N a) When the channel rate is very large, and its delay is very small b) When both the channel rate and delay are very large. c) When the sender window size is equal to 1 d) When the sender window size is less than 2m e) When the receiver window size is larger than 1 5. In Go-Back-N, if the receiver gets an out of order frame, it: a) Sends a NACK b) Sends an ACK c) Store the frame d) Keeps silent e) Discards the frame