Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to identify and treat black widow spider bites [title] Recognize a bite from a black widow spider. [step] Black widow spiders have fangs. When bitten, two small puncture wounds are usually visible.

Ending1: A puncture is a visible spot on the spider where you can see blood. [substeps] Black widow bites tend to be oval and round. Ending2: A black widow spider's blood vessels are pink and fluid; they cannot leak blood from these wounds. In the first place, the two puncture wounds are places where the venom is produced. Ending3: One puncture will be lined in a pink layer. The other will appear red and crusty. Ending4: [substeps] As the venom from the bite spreads, the area develops a target-like appearance. The fang marks are in the center, surrounded by an area of reddened skin, then another circle of red just a little further beyond the center.

Answer format: ending1/ending2/ending3/ending4