Determine the Indicated Probability for a Poisson Random Variable with the Given

Multiple Choice

Determine the indicated probability for a Poisson random variable with the given values of $\lambda$ and t .
$\lambda = 0.5 , t = 4 , P ( \text { At least 2 } )$

A) 0.8647
B) 0.1353
C) 0.5940
D) 0.3233