NPV Vs BCR Vs IRR

[JOYDIP DEY]

Dear Friends,
Can anybody explain me the meaning and interpretation of the following question: At the discount rate equal to IRR:
a) NPV < 0 and BCR < 1
b) NPV > 0 and BCR > 1
c) NPV = 0 and BCR = 1
d) None of the above
I am not in a position to even understand "What is asked in the Question"?

[Prembalaji]

This Link should do the trick for you in Understanding

https://www.youtube.com/watch?v=yIMMy8hh0WQ