Step 1: Recall the standard list of CAS benefits.
The usual benefits are speed, accuracy, timely reports, better record keeping, control, and saving of time, cost and effort.
Step 2: Match the options with the list.
Option 1 is timely reports, option 2 is better record keeping, and option 3 is control. All three sit on the list.
Step 3: Look at option 4 closely.
It talks about economy in processing being "minimised". A benefit would say that the cost of processing is reduced, so economy is achieved or increased. The word "minimised" reverses the meaning.
Step 4: Decide.
Since option 4 states the opposite of a real benefit, it is the only one that is not an advantage.
\[ \boxed{\text{Option 4}} \]
Final Answer:
Option 4 is not an advantage of CAS.