Optionshouse trading levels

Anyone know what is included in the Optionshouse trading levels? I just received confirmation via email that my account is open with the following trading level:

Your MARGIN account is approved for Trading Level 2 which includes:
•Purchase stock, options, and mutual funds
•Trade covered calls
•Sell cash-secured puts
•Trade credit and debit spreads
•Short stock

I looked online to see what is in Level 3 but cannot find any documentation that clearly defines the levels...does anyone know what they are?
 
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