Question $6\mathrm{.}24-$ The truss tower shown in Fig. $6\mathrm{.}28$ has $9$ joints and $17$ members. All joints are pinned and the bars comprising X$-$bracings are not connected at their respective cross$-$points.

Fig. $6\mathrm{.}28$

The total degree of indeterminacy of the tower is:

A$.1$

B$.2$

C$.3$

D$.4$