Confused by this question - help?

[MK1]

I’m revising for an exam and they’ve given me a multiple choice question paper but no answers (helpful!). Can anyone help me out with this one?

An insulation resistance test between live conductors on a single-phase circuit has been carried out and gives you a reading of 0.00M ohms. State one likely condition that could cause this value?

a) A resistive fault has occurred between conductors and water is present
b) A short circuit of negligible impedence between L and N
c) A short circuit of negligible impedance between L and cpc
d) A healthy circuit

 

[Wilko]

Yes Spin and Andy are correct - recall (look up) the definition of live conductor and go from there.

 

[static zap]

but it's a stupid question 0.00Megohms could be a residstance of anything uo to 999k ohms.

..maybe just under 9k but then who knows what will round to 0.01...
then there are the 1-or-2 lowest counts of some meters
Has anyone got a 4k7 / 8k2 resistor rated 250V to hand ?
(any nit pickers -who can be -arsked- )