Let X be a dataframe with $100$ rows and $5$ columns, let y be the target with $100$ samples,assuming all the relevant libraries and data have been imported, the following line of code has been executed:

LR $=$ LinearRegression$()$

LR$.$fit$($X$,$ y$)$

yhat $=$ LR$.$predict$($X$)$

How many samples does yhat contain?

Question $17$ options:

$500$

$100$

$0$

$5$