Question $1$

$2$ pts

Imagine we have a dataframe, df$.$ What would be the purpose for running code like the below? $($why would we run it$?)$

df$.$ loc$[1]$

To look for, retrieve a value from df

to locate all missing values and replace with "missing"

to add $1$ to the dataframe

there is no method called $.$loc

to rename $df$ as loc