Estimation and Costing Estimation of Wiring

What should be the insulation resistance if there are 20 wiring points? 

1
It should not be less than 1 megaohms. 
2
It should not be less than 2.5 megaohms.
3
It should not be less than 5 megaohms.
4
It should not be less than 10 megaohms.
5
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