Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to smoke baby back ribs [title] Trim off the membrane from 3 to 4 slabs of baby back ribs. [step] Insert the tip of a butter knife underneath the thin, white silver membrane to loosen it a little. Take a paper towel and use it to grip the silver membrane.

Ending1: Pull the membrane completely off and discard it. [substeps] If you leave the membrane on, the membrane will become tough and chewy as the ribs cook. Ending2: This membrane should work quite nicely while still detangling the ribs. [title] Place the two sides on a serving sheet. Ending3: Then use the knife to slice off the white membrane and discard the bones. [substeps] The acidity of the baby back ribs prevents them from drying out. Ending4: Again, that membrane will release some of the smoke it has released. Use your fingers to pry the membrane away from the ribs.

Answer format: ending1/ending2/ending3/ending4