A2. Using the digits $1,2,3,4,5,6,7$ and 9, we form six-digit even numbers, where the first digit is a prime number. How many such six-digit numbers are there?
(A) 20160
(B) 9440
(C) 25552
(D) 4320
(E) 49152
A2. A six-digit number can be composed in $4 \cdot 8 \cdot 8 \cdot 8 \cdot 8 \cdot 3=49152$ ways.