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Let \( A, B \) and \( C \) be three sets such that
\[
\begin{array}{l}
A=\left\{(x, y) \mid \frac{x}{\cos \theta}=\frac{y}{\sin \theta}=5, \text { where ' } \theta^{\prime} \text { is parameter }\right\} \\
B=\left\{(x, y) \mid \frac{x-3}{\cos \phi}=\frac{y-4}{\sin \phi}=r\right\} \\
C=\left\{(x, y) \mid(x-3)^{2}+(y-4)^{2} \leq R^{2}\right\}
\end{array}
\]
P
W.
If \( \phi \) is fixed and \( r \) varies and \( n(A \cap B)=1 \), then \( \sec \phi \) is equal to
(1) \( \frac{5}{4} \)
(2) \( \frac{-5}{4} \)
(3) \( \frac{5}{3} \)
(4) \( \frac{-5}{3} \)
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