Find the decimal equivalent of the following number shown in expanded form.

4 x 1,000 + 5 x 100 + 3 x 10 + 9 x 1 + 4 x 1/10 + 2 x 1/100 + 5 x 1/1000

A
4,539.425

B
4,539,425
C
45,394.25
D
4,359.425