Consider the sequence shown. 436, 218, 109, 54.5, 27.25,...

Select the correct explicit formula for the sequence.

a
g_n=436·0.5^{(n-1)}

b
g_n=0.5·436^{(n-1)}

c
g_n=436·2^{(n-1)}

d
g_n=2·436^{(n-1)}