homeland is an organization that rescues abandoned dogs. they set up a hotline for the general public to report any street dog that they spot anywhere in the city or any dog that they feel needs to be rescued. within 12 hours of the hotline being activated, the network starts experiencing congestion, messages are corrupted or dropped, and connected devices start resending frames to make up for the loss. these kinds of problems are overwhelming the network as a whole. this generates even more traffic, making the congestion even worse. analyze which of the following policies homeland should adopt to detect congestion on the network after experiencing several missed acknowledgment messages.1. Explicit signaling
2. Backpressure
3. Implicit signaling
4. Choke packet