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Which command is used to open an asynchronous connection for a "GET" request?

new XMLHttpRequest$().$open $("$GET$",$ url, false$)$;

new XMLHttpRequest$().$open $("$GET$",$ url, true$)$;

new XMLHttpRequest$().$open $("$GET$",$ url$)$;

new XMLHttpRequest$().$open $("$POST$",$ url, true$)$;