Graph shows three waves that are separately sent along a string that is stretched under a certain tension along x-axis. If `omega_(1),omega_(2) and omega_(3)` are their angular frequencies, respectively, then:
A. `omega_(1)=omega_(3)gtometa_(2)`
B. `omega_(1)gtomega_(2)omega_(3)`
C. `omega_(1)gtomega_(1)=omega_(2)`
D. `omega_(1)=omega_(2)=omega_(3)`
