How many forward paths are there in the given Signal Flow Glow?

Correct option is B

​$$\text{A forward path is a path that starts at the input } R(s), \text{ ends at the output } Y(s), \text{ and does not pass through any node more than once.} \\[8pt]\text{From the given signal flow graph:} \\[8pt]\textbf{Forward Path 1 :} \\[6pt]R(s) \rightarrow G_1 \rightarrow G_2 \rightarrow G_3 \rightarrow G_4 \rightarrow Y(s) \\$$​​