The temperature variation in a large plate, as shown in the below figure, would correspond to which of the following condition (s)? (IES-98)
1. Unsteady heat.
2. Steady- state with variation of k.
3. Steady – state with heat generation.
Select the correct answer using the codes given below:
a) 2 alone b) 1 and 2
c) 1 and 3 d) 1,2 and 3