Consider the MGF MX(t)=0.3+0.7etM_X(t) = 0.3 + 0.7e^tMX(t)=0.3+0.7et. Which distribution does XXX follow?
Bernoulli with p=0.7p=0.7p=0.7
Binomial with n=0.7,p=0.3n=0.7, p=0.3n=0.7,p=0.3
Poisson with λ=0.7\lambda=0.7λ=0.7
Uniform on {0,1}\{0, 1\}{0,1}