Y1 : It is not mandatory for every signal to be even or odd

 Y1 : It is not mandatory for every signal to be even or odd

Y2 : : Any signal which is neither even nor odd can be expressed as the difference of even and odd signals

a. Y1 only

b. Y2 only

c. Both Y1 & Y2 are correct but Y2 is not a reason for Y1

d. Both Y1 & Y2 are correct but Y2 is definitely a reason of Y1

ANSWER: Y1 only

Explanation:

The statement Y1 is only precise because every signal should not be necessarily even or odd. It can also belong to some other category of signals. Also, the signal which is neither odd nor even odd is basically expressed as the addition (sum) of even and odd signals.