One of the two old cars have/has been taken to garage.

In the above sentence what should be used, HAVE or HAS ??

A. Which one is correct and why ?
B. "Has" is plural or singular ?
C. Does any of the below 5 rule apply here ?

1. One of the Xs that/who <plural>
2. One of the Xs <singular>
3. only One of the Xs <singular>
4. only One of the Xs that/who <plural>
5. "the" only One of the Xs that/who <singular>