MCQ

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Assertion $(A):$ If the function $f(x)=\frac{a e^x+b e^{-x}}{c e^x+d e^{-x}}$ is increasing function of $x$, then $b c > a d$.
Reason $(R):$ A function $f(x)$ is increasing if $f^{\prime}(x) > 0$ for all $x$.

• A
  Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A).$
• ✓
  Both $(A)$ and $(R)$ are true but $(R)$ is not the correct explanation of $(A).$
• C
  $(A)$ is true but $(R)$ is false.
• D
  $(A)$ is false but $(R)$ is true.