hi peets
you are doing the right thing in anwering yourself and asking for comments
New J is NOT mathematician and his answer is based in comething called conditional probability which is not being tested here
1 - is correct - there should be no risk to using a company USB within the company confines
2 is riskier as they are asking if it is easier to be hacked / blue toothed, and the answer to that is yes
but remember in things like this - it is not what is true it is what the course text has told you
paeople have difficulty in accepting an exam is about what is in the set text - not what happens in the big wide world.
not a good question - it requires quite advanced knowledge of english which is not being tested
it would be more accurate to say - whcih is better ....