What is the best description of a closed system?

a system in which matter and energy are not exchanged with the surroundings
a system in which both matter and energy are exchanged freely between the system and the surroundings
a system in which energy can enter or leave the system but matter cannot
a system in which matter can enter or leave the system but energy cannot

A closed system is a system in which matter and energy are not exchanged with the surroundings.

Explanation:

A closed system is a physical system that does not interact with other physical agents located outside it and therefore is not connected casually or related to anything external to it. The total energy of a closed system is conserved; in fact, a closed system when it is isolated can not exchange energy with anything external to it.

A distinction is made between open system and closed system. An open system exchanges matter with the surroundings, while a closed system does not.

answer; /// the only one thats make little sense is (c) fair credit billing act;

to stay where they were until m sent for