What is the difference between absolute location and relative location

A relative location is the position of something relative to another landmark. For example, you might say you're 50 miles west of Houston. An absolute location describes a fixed position that never changes, regardless of your current location. It is identified by specific coordinates, such as latitude and longitude.

Hope this helps! (If not I'm sorry!)

a and b because with the other three, they simplify to something else.