The first example is bad. 3 words .com with 10 searches a month. It would receive 0 visitors per year.
The c) option could have Type in visitors, but approx. 3-5 a year. I have 2 word .com name with 10K searches and it receives 2-5 visitors per month. My 2 word .net with 110K searches receives approx. 10 visitors per month.
If you consider to make money with parking, I would not buy them if I were you.