The solution set of is
Explanation for the correct option:
The given equation: .
As an exponential expression always has a positive value.
Thus, .
So, should also be positive.
Now, .
It is known that, (Since squaring a number gives only positive values)
Thus, is always negative.
Hence, the given equation has no real roots.
Therefore, the solution set of is .
Hence, option C is correct.