Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to buy a pet hermit crab [title] Look for a healthy crab. [step] Crabs that do not come out of their shells when misted might be ill, and should not be purchased. Likewise, if you see tiny crab limbs scattered about a crab's tank, do not purchase it.

Ending1: This is a sign that the crab is stressed and vulnerable to other illnesses. [substeps] Do not obtain crabs that have a musty smell. Ending2: When purchasing a crab, first check for an intact shell : [substeps] If you encounter one injured crab, you should consult a vet or pick it up by hand. The natural shell is more sturdy and more durable than any other joint in the crab's body. Ending3: [substeps] Hermit crabs may have underground gills that communicate with their owners through electric stimulation. Head out to the pet store and look at their gills to check for these. Ending4: [substeps] If you pick up a crab by the tail, it likely does not have healthy shells. Unless you have a scallop crab, it would likely be fine with you to buy a crab shell, as their spines have been examined and they have great teeth that you cannot cut.

Answer format: ending1/ending2/ending3/ending4