MASS CONFUSION

I had my first CSC165 tutorial today. It is a small class and we got to go through all of the exercise in small groups. I enjoy doing small group settings instead of large lectures because I feel like it is easier to ask questions that way. One of the questions that was raised in my class was over Question 2, part b/d:

There is one of the three python programs that passes all three test suites. and There is one of the three python programs that fails all three test suites. My TA, along with several of my classmates interpreted this question as there being at least one of the three python programs that passes/fails all three test suites. I interpreted it as being simply only one program. Because of this confusion, my answers were different from the TA's solutions. Who is right? I am not sure what the proper "correct" answer was, but it was still nice that we were able to debate our points. My TA said that he will ask professor what he believes in the correct interpretation of the problem... so, until next week!