About Question enthuware.ocajp.i.v7.2.1200 :

[ETS User]

The alternatives for this question are erroneus. No matter which option you leave unchecked, the line(s) mentioned in that option will already be covered by some of the other options. So checking 4 arbitrary options will always be equivalent to checking all of them.

[admin]

I am not sure what you mean because if you just remove //5 as mentioned in option 2, the code will not compile. May be a adding the statement, "Assume that the options are independent of each other", will make it more clear?
-Paul.