A nellular operater nesds a database to beep track af its custamers, their suberription plara, and the handsets (mobile ptonsi) that they are wing. The I-R diagram in the fallowing figure ilhastrates the key entities of interest to the operabor and the relatianstuips betweta thum. Based an the figare, arswer the followirg questione and explein the ratiande far your reaportse. For esch question, identify the elementigy in the E-R diagram that pou used to detectuine your answer. c. Is it poeethle to ervale a plan wilhout knowing who the cualemer i9? d. Is it passible bo maintain data rogarding a handect without comnecting it to a plan? e. Can a handeet be aseaciabed with amelt ltalic w? acwumenolsteti within thine getiel irklexled in the figure? G. Is the company able tn tads a mamafachurer without maintainmg information about its handests? h Can the sane openating syetum be used cn multiple handat types? i. Charocteriae the degrex and the cardinsitice of the relatemship that oxnecte Castamer bo iteself. Explain its meving. k. Can the compony track a handset wathonat idmifing ite opmating ajatum