The figure shows a spool placed at rest on a horizontal rough surface. A tightly wound string on...

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The figure shows a spool placed at rest on a horizontal rough surface. A tightly wound string on the inner cylinder is pulled horizontally with a force \( F \). Identify the correct alternative related to the friction force \( f \) acting on the spool
(a) \( f \) acts leftwards with \( fF \)
(b) \( f \) acts leftwards but nothing can be said about its magnitude
(c) \( fF \) but nothing can be said about its magnitude
(d) None of the above
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