Wow...you don't know what the C Fund is?
You sure talk a good game...but the actual knowledge isn't there is it?
Serious? Or a clever illustration of Poe's Law (extended).
For the record, I am not a government employee and never have been and thus have little need to be concerned about Thrift Savings Funds on more than a very cursory level. I know what they are in general, but, no, I don't recall off the top of my head what type of fund each letter refers to. Why would I? That is, other than when someone I know that does work for the government asks me what I think about such options, which hasn't been all that often and certainly hasn't happened any time recently.