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If at t = 0, a travelling wave pulse on ...

If at `t = 0`, a travelling wave pulse on a string is described by the function.
`y = (6)/(x^(2) + 3)`
What will be the waves function representing the pulse at time `t`, if the pulse is propagating along positive x-axis with speed `4m//s`?

A

Y = 6/[`(x+4t)^2` + 3]

B

Y = 6/[`(x-4t)^2` + 3]

C

Y = 6/`(x + t)^2`

D

Y = 6/[`(x - t)^2` + 10]

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