Naked Call: Sell Call (S=50)
Risk: Unlimited-Upside
Profit Potential: Limited-Downside
Equivalent Positions: Short Stock/Short Put
Follow-up Action: If stock increases roll up and out for credits
Bearish Splitting Strikes: Buy Out Of Money Put (S=50), And Sell Out Of Money Call (S=55)
Risk: Unlimited-upside
Profit Potential: Unlimited-downside
Equivalent Positions: None
Follow-up Action: None
Bearish Put Calendar Spread: Buy A Long Term Put (S=55, T=.5)), And Sell A Short Term Put (S=55) Against It,
With Strikes Above Stock Price
Risk: Limited-both up and down
Profit Potential: Limited-at strike
Equivalent Positions: None
Follow-up Action: Roll the short term calls forward