Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose feline upper respiratory illness [title] Keep an eye out for nasal discharge. [step] Like a cold or flu in humans, a urti will be uncomfortable for a cat because of the symptoms associated with it. A cat suffering from a urti will usually exhibit nasal discharge and the irritation associated with that.

Ending1: [substeps] The cat won't initially show signs of improvement. Instead, the cat will show fewer and fewer symptoms. Ending2: [substeps] A feline upper respiratory infection often appears as a white, lumpy, or red film and develops on the facial tissues. The symptoms can linger for weeks or even months. Ending3: [substeps] Nasal discharge can cause the cat to have a very crusty nose. When the discharge is not wiped away, it can dry under and around the nose area. Ending4: If your cat exhibits any of the following symptoms, call your vet : [substeps] Mucus that may be stuck in its nostrils discharge coming out of the nose. [title] Monitor its appetite, getting more than 4 milligrams of fresh milk daily.

Answer format: ending1/ending2/ending3/ending4