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What are the conditions of revenue function $R$ to be maximum ?

• ✓
  $\frac{d \mathrm{R}}{d x}= 0, \frac{d^{2} \mathrm{R}}{d x^{2}} < 0$
• B
  $\frac{d \mathrm{R}}{d x}= 0, \frac{d^{2} \mathrm{R}}{d x^{2}} > 0$
• C
  $\frac{d \mathrm{R}}{d x} > 0, \frac{d^{2} \mathrm{R}}{d x^{2}} < 0$
• D
  $\frac{d \mathrm{R}}{d x} > 0, \frac{d^{2} \mathrm{R}}{d x^{2}} > 0$