I got $2\mathrm{.}0/2\mathrm{.}4$ on this question and am confused as to which one I got wrong.

For each expression of decimal floating point below, choose the best form of the expression from the

dropdown list.

$30\mathrm{.}15{10}^{-5}$ is

$0\mathrm{.}15{10}^1$ is

$105$ is

$.0\mathrm{.}001{10}^{-20}$ is

$1\mathrm{.}88{10}^{29}$ is

$4\mathrm{.}33e-100$ is

Answer $1$:

scientific notation but not normalized

Answer $2$:

scientific notation but not normalized

Answer $3$:

not scientific notation

Answer $4$:

scientific notation but not normalized

Answer $5$:

normalized floating point

Answer $6$:

normalized floating point