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Consider the three waves \( z_{1}, z_{2} \) and \( z_{3} \) as
\[
z_{1}=A \sin (k x-\omega t), z_{2}=A \sin (k x+\omega t)
\]
\( \mathrm{P} \)
W
and \( z_{3}=A \sin (k y-\omega t) \). Which of the following represents a
standing wave
[DCE 2004]
(a) \( z_{1}+z_{2} \)
(b) \( z_{2}+z_{3} \)
(c) \( z_{3}+z_{1} \)
(d) \( z_{1}+z_{2}+z_{3} \)
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