I know very little about investments and the like. So I don't really want to invest. I just want to deposit some money temporarily (for 9 months) in order to earn Starwood points.

I've gone to the Ameritrade website, but have not yet found the information I am seeking. My question: how can I deposit my money for the 9 months to earn the points I seek - while keeping my money safe? Do they have simple CDs where you put your money in for a specified (9-month) period, then withdraw it after the specified period with your money intact? I will give them a call, but wondered if other FTs who have deposited money simply to earn points or miles could state what route they took. (If such advice should not be given here since it would be considered financial advice, that is fine. I'm just trying to earn points and saw this offer on FT.)