Even more interesting answer statistics. The documentation is very clear and up-front about two limitations: (i) resource govenor doesn't work across instances and(ii) resource govenor doesn't concern itself with system tasks, only user tasks. So which two of the six options are not supported is surely absolutely obvious to anyone who has read the documentation or who reads it to find teh answer to this question, so selecting which four are supported ia rather easy. Yet of the answers to date, more than two thirds have selected at least one of the two unsupported options, and more than one in five has selected both unsupported options.
Clearly people need to be better educated in this area, if they are to be capable of using Resource Governor. So this is a very good question from the point of view of showing people where they need to do some learning.