题目内容：
根据下面内容，回答题
Thisnoticeconcernsallemployeeswhousetheconferencerooms.Startingimmediately,youwillneedtoofficiallyreserveanyconferenceroomyouwishtouse.Anyreservationsoflongerthanthreeconsecutivehourswillrequirethewrittenapprovalofyourdepartmentmanager.
Reservationformsareavailableintheemployeelounge.Youmustsubmiteachformtoyourdepartmentsecreauryatleastthreebusinessdaysinadvance.Ifyouneedtocancelameeting,pleasebesuretoinformthesecretarysothatyourreservationmaybecanceledaswell.Anyem-ployeesusingtheconferenceroomswithoutproperauthorization,willbeaskedtoleave.
Thankyouinadvanceforyourcooperationinthismatter.
JosephMohammad
AssistantDirectorofOperations
From:HollyGraham<graham1917@nkkcompany.com>
To:JosephMohammad<mohahello@nkkcompany.com>
Subject:Aboutthereservationofconferenceroom
DearJoseph,
I'mwritinginresponsetoyournoticeonreservingconferencerooms.Asacompanysalesmanager,Ihavetosaythatmysalespeoplearenottoohappywiththissuddenchangeinproce-dure.
Pleasekeepinmindthattheyareoftenawayonbusinesstripsorworkingonotherassign-mentsthatkeepthemoutoftheofficeforlongperiodsoftime.Theysimplydon'thavethetimetocheckthescheduleandmakereservationlikeon-siteemployees.Ifoneofourclientsshowsupunexpectedly,itwillbeembarrassingforeveryoneifwedon'thaveaconferenceroomavailable.I'dlikeyoutoconsidermakinganamendmenttotherule,allowingoursalesforcetoreserveconferenceroomsatshortnotice.Thanks.
HollyGraham
Whatisthenoticemainlyabout? A．Conferenceroomsmaynotbeusedformorethanthreehours
B．Ameetingintheconferenceroomhasbeencanceled
C．Employeesmustreserveconferenceroomsinadvance
D．Onlydepartmentmanagersmayusetheconferencerooms
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