A force \( F=t \) is applied to block \( A \) as shown in figure. The force is applied at \( t=0...

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A force \( F=t \) is applied to block \( A \) as shown in figure. The force is applied at \( t=0 \) seconds when the system was at rest and string is just straight without tension. Which of the following graphs gives the friction force between \( B \) and horizontal surface as a function of time \( t \) .
\( (a) \)
\( (c) \)
(b)
(d)
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