I’m inheriting $100K. Is a 5.5% CD a good rate? Where do I invest for zero risk?

Dear Quentin,

I’ll be inheriting about $100,000 very soon. It all depends on when probate is settled. I’ve never had this kind of money before, or access to this kind of money, so I know nothing about investing. I am only interested in zero risk. I saw a billboard for a bank that has a 13-month certificate of deposit for 5.5%. 

Is…