A$\sigma(X)_{i} = \frac{exp(x_{i})}{\sum_{j=1}^{n}{exp(x_{i})}}$
B$\sigma(X)_{i} = \frac{exp(x_{i})}{\sum_{j=1}^{n}{exp(x_{i}·x_{i+1})}}$
C$\sigma(X)_{i} = \frac{exp(x_{i}·x_{i+1})}{\sum_{j=1}^{n}{exp(x_{i})}}$
D$\sigma(X)_{i} = \frac{exp(x_{i}·x_{i})}{\sum_{j=1}^{n}{exp(x_{i})}}$