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answer is 4 . please explain

AB and CD are connected in an electric circuit in which an electric current is flowing.No current is flowing in these conductors.AB and CD are connected by conductor EF:-

(1) No current will flow through EF

(2) Current will flow from F to E

(3) Current will flow from E to F and the potential at E will be equal to that at A or B

(4) Current will flow from E to F and the potential at E will be less than at A or B

$AscurrentflowsfrompointBtopointDsopotentialofBisgreaterthanthatofD.\phantom{\rule{0ex}{0ex}}and{V}_{B}{V}_{D}\phantom{\rule{0ex}{0ex}}potentialofA=potentialofB=potentialofE(asthereisnoresis\mathrm{tan}cebetweenBandE)\phantom{\rule{0ex}{0ex}}and\phantom{\rule{0ex}{0ex}}potentialofC=potentialofD=potentialofF\phantom{\rule{0ex}{0ex}}{V}_{B}{V}_{D}\phantom{\rule{0ex}{0ex}}{V}_{E}{V}_{F}\phantom{\rule{0ex}{0ex}}currentwillflowfrompointEtoF.\phantom{\rule{0ex}{0ex}}sooption3iscorrect.\phantom{\rule{0ex}{0ex}}Regards\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}$

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