The roots of the equation are 

a) 
All real 
b) 
All imaginary 
c) 
Two real and two imaginary 
d) 
None of these 
The roots of the equation are 

a) 
All real 
b) 
All imaginary 
c) 
Two real and two imaginary 
d) 
None of these 
(c)
Let Then,
The equation has imaginary roots. Thus, the given equation has two real and two imaginary roots