In the above diagram, object \(A\) weighing \(6 \text{ kg}\) is on a frictionless desk. Object \(B\) weighing \(3 \text{ kg}\) is firmly attached to \(A,\) moving together with it. Object \(C\) weighing \(1 \text{ kg}\) is connected with object \(B\) by a pulley. Which of the following statements is correct?

\(a)\) The magnitude of the force with which the string is pulling object C is \(9\) N.
\(b)\) The direction of the friction force upon object \(B\) is the same as the direction of motion of object \(A.\)
\(c)\) The magnitude of the friction force upon object \(B\) is \(6\) N.

Gravitational acceleration is \( g= 10 \text{ m/s}^2. \)


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