Select one of the following that is set: Set of office computer system, Collection of delicious dishes, Mathematics books of class X, Collection of greater numbers

Select one of the following that is set: Set of office computer system, Collection of delicious dishes, Mathematics books of class X, Collection of greater numbers

Explanation
A set is a well-defined collection where each item is distinct and identifiable.
"Office computer system" components (like monitor, CPU, keyboard) are clearly listed and countable.