For an arithmetic sequence $(a_n)$ with distinct terms and common difference $r$,
$$\begin{aligned}
& a _ { 1 } = 3 \cdot r \\
& a _ { 6 } = a _ { 2 } \cdot a _ { 4 }
\end{aligned}$$
the equalities are given.
Accordingly, what is $\mathbf { a } _ { \mathbf { 1 0 } }$?
A) 10
B) 8
C) 6
D) 4
E) 2