Determine the Equation of the Graph $\mathrm { F } = 60$

Determine the equation of the graph.
-A guitar string is plucked so that it vibrates with a frequency of $\mathrm { F } = 60$ . Suppose the maximum displacement at the center of the string is $\mathrm { s } ( 0 ) = 0.54$ . Find an equation of the form $\mathrm { s } ( \mathrm { t } ) = \mathrm { a } \cos \mathrm { bt }$ to model this displacement. Round constants to 2 decimal places.

A) $s ( t ) = 1.08 \cos 376.99 t$
B) $s ( t ) = 1.08 \cos 9.55 t$
C) $s ( t ) = 0.54 \cos 9.55 t$
D) $\mathrm { s } ( \mathrm { t } ) = 0.54 \cos 376.99 \mathrm { t }$