For a project, 16 schools were selected from each of Turkey's 81 provinces, and a message was sent to each school's principal. Then, each school's principal sent this message to 35 teachers in their school.
Accordingly, what is the total number of principals and teachers to whom this message was sent?\\
A) $4^{6}$\\
B) $5^{6}$\\
C) $6^{6}$\\
D) $7 \cdot 5^{5}$\\
E) $8^{6}$