Consider a $5-$ tap moving average filter. The following input is given to the system

x$[$n$]=10+5$cos$(0\mathrm{.}4\backslash$pi n$)$

Let the corresponding steady state output be

y$[$n$]=$A$+$Bcos$(0\mathrm{.}4\backslash$pi n$+\backslash$theta $\_(1))$

Draw the pole zero plot of the filter. From the pole zero plot, the value of B is