Work Breakdown Structure

Based on the image, which of the following is the correct WBS Code for Touch Sensors?

Question $2$ options:

$1\mathrm{.}2\mathrm{.}2\mathrm{.}3\mathrm{.}2$

$1\mathrm{.}2\mathrm{.}3\mathrm{.}3\mathrm{.}2$

$1\mathrm{.}2\mathrm{.}3\mathrm{.}3\mathrm{.}2\mathrm{.}3$

$1\mathrm{.}1\mathrm{.}2\mathrm{.}3\mathrm{.}2$