The p.d.f of Poisson Distribution is given by ___________

• A. \(\frac{e^{-m}m^x}{x!}\)
• B. \(\frac{e^{-m}x!}{m^x}\)
• C. \(\frac{x!}{m^xe^{-m}}\)
• D. \(\frac{e^m m^x}{x!}\)