At the same instant, if the component of the force at joint \(A\) along \(A B\) is \(30 \mathrm{~N}\), then the magnitude of the joint raction at \(O_{2}\)

(a) is zero

(b) is \(30 \mathrm{~N}\)

(c) is \(78 \mathrm{~N}\)

(d) cannot be determined from the given data