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Rho is the options Greek that measures how much an option’s theoretical value changes with a 1% increase or decrease in the risk-free interest rate.

Vega is the option Greek that measures the expected change in an option's price for a 1% increase or decrease in implied volatility.

In options trading, time decay refers to the erosion of an option's value as its expiration date approaches. The option Greek theta quantifies this decay, showing how much value an option loses daily, assuming other factors (like implied volatility and the underlying price) remain constant.

Regulation T (Reg T) sets fixed margin requirements for each individual position, while portfolio margin adjusts based on a portfolio's overall risk. Because of this, portfolio margin accounts allow for greater leverage and lower margin requirements.

Gamma measures how the delta of an option changes relative to a $1 change in the underlying asset's price. Long options always have a positive gamma, which ranges from 0 to 1.

The delta of an options contract tells us how much the price of an option is expected to change relative to a $1 move in the price of the underlying asset.