What is a "B" neighborhood in the Phoenix metro area?

[Rudy Coronel]

Hi, I'm an aspiring investor and I'm beginning to analyze multifamily properties. I know that I do not want to invest in D class neighborhoods but I also want to stay away from the A class. I'm having difficulty distinguishing the classes in between as I look at properties on the MLS. I think I will invest in the north or east relative to central Phoenix but that can change. What are the criteria of B and/or C+ neighborhoods in your opinion? Can anyone provide the names of neighborhoods for better understanding? Does anyone recommend starting at C versus B?

I intend to buy a property within the year.

Thanks to anyone willing to help me out here.