Which of the following is the correct formula for the Heisenberg uncertainty principle?
- A$\Delta x \cdot \Delta p \ge \frac{h}{4\pi}$
- B$\Delta x \cdot \Delta p = \frac{h}{4\pi}$
- C$\Delta x \cdot \Delta p \le \frac{h}{4\pi}$
- D$\Delta x \cdot \Delta p < \frac{h}{4\pi}$
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