Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to deal with a demanding professor [title] Take a deep breath. [step] Plenty of professors like to act tough up front to weed out anyone who doesn't belong in the class. Keep in mind that it's often just a tactic.

Ending1: Of course, the class may still be plenty difficult, but you may find that your professor drops some of the toughness act later on. [title] Don't drop the class immediately. Ending2: Treat your professor as though their authority is your, not yours. [title] Speak kindly of a professor who works with you on a regular basis. Ending3: It can irritate a professor's ego, which is why you might try this technique. [substeps] Suck in your belly when you're feeling frustrated. Ending4: Either this, or outright rejection is inevitable. Look at your own work to figure out if it would be the right fit for you.

Answer format: ending1/ending2/ending3/ending4