Which of the following illustrates the product rule for logarithmic equations?

$\log _2(4 x)=\log _2 4+\log _2 x$
$\log _2(4 x)=\log _2 4-\log _2 x$
$\log _2(4 x)=\log _2 4 \cdot \log _2 x$
$\log _2(4 x)=\log _2 4 \div \log _2 x$