Who opened and closed the meeting to sign the peace treaty?

The one that opened and closed the meeting to sign the peace treaty was: The big four

The treaty of Versailles is the treaty that officially closed the world war I, Which was staged by France, Great Britain, and the US

The treaty not only talked about ending the war, but also talked about potential economic and trading agreement between the countries.

The big four opened and closed the meeting to sign the peace treaty.