Under what conditions the three signals x(t), y(t) and z(t) with period t1 t2 and t3 respectively are periodic?

All the ratios of the three periods in any order is rational

Under what conditions the three signals x(t), y(t) and z(t) with peri

1.	Under what conditions the three signals x(t), y(t) and z(t) with period t1 t2 and t3 respectively are periodic?
A.	t1/t2= t2/t3
B.	t1/t2 is rational
C.	All the ratios of the three periods in any order is rational
D.	t1/t2/t3= rational
Answer» D. t1/t2/t3= rational