The word "and" is the appropriate choice here, if the intended meaning is that all three things are prohibited.
I've read a justification for using "or" in situations like this, and there's a subtle logical error in it. This is not going to be relevant in GMAT SC, but I'll point it out anyway - for interest only!
The justification for using "or" goes like this:
- if we say "X, Y, or Z", we mean one or more of these things
- so if we say "*not* X,
...
I've read a justification for using "or" in situations like this, and there's a subtle logical error in it. This is not going to be relevant in GMAT SC, but I'll point it out anyway - for interest only!
The justification for using "or" goes like this:
- if we say "X, Y, or Z", we mean one or more of these things
- so if we say "*not* X,
...
