Cash-Secured put
The setup:
Sell a put, strike price A
Keep enough cash on hand to buy the stock if the put is assigned
Generally, the stock price will be above strike A
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Covered Call
You own the stock
Sell a call, strike price A
Generally, the stock price will be below strike A
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Protective Put
You own the stock
Buy a put, strike price A
Generally, the stock price will be above strike A
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Collar
You own the stock
Buy a put, strike price A
Sell a call, strike price B
Generally, the stock price will be between strike A and strike B