The figure represents the instantaneous picture of a transverse harmonic wave traveling along the negative $x$-axis. Choose the correct alternative $(s)$ related to the movement of the nine points shown in the figure. The points moving upward is/are
A$a$
B$g$
C$f$
Dboth $(A)$ and $(B)$
Medium
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Dboth $(A)$ and $(B)$
d
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