Economics GURU - naveen SIR

. क्या दूं गुरु-दक्षिणा,
मन ही मन मैं सोचूं।
चुका न पाऊं ऋण मैं तेरा,
अगर जीवन भी अपना दे दूं

National income known as :
(A) GNP at MP
(B) GDP at FC
(C) NNP at FC
(D) GDP at MP

Indifference curve may be concave, when :
(a) MRS is increasing (b) MRS is constant
(c) MRS is decreasing (d) All the above