Review the following code:

import plotly.express as px

data $=\{\text{'}$a$\text{'}$: $[1,2,3,4],\text{'}$b$\text{'}$: $[4,3,2,1]\}$

fig $=$ px$.$line$($data$,$ x$=\text{'}$a$\text{'},$ y$=\text{'}$b$\text{'})$

fig.show$()$

What will happen when this code is executed?

Group of answer choices

An error will occur because the data is not in a DataFrame.

A line chart will be displayed with $\text{'}$a$\text{'}$ as the x$-$axis and $\text{'}$b$\text{'}$ as the y$-$axis.

Nothing will be displayed as px$.$line is not a valid function.

An error will occur because the labels for the axes are not specified.