Answer 4 is the correct one.
Complicated instruments can possibly produce unreliable data depending on if they were used correctly, but they don't always do so.
Simple instruments like rulers can produce unreliable data if the data required is extremely precise, such as decimal measurements, but larger measurement values are typically fine.
More expensive equipment doesn't necessarily mean that it's better, it's just what the manufacturer decided to price the equipment at.
Depending on the situation, different equipment can be better, from a ruler to a caliper.
