What data type does the following function return?

def

read$\_$text$($filename$)$:

def read$\_$text$($filename$)$:

words

$=$

$[]$

words $=[]$

with

open$($filename$,$

$"$r$")$

as

infile:

with open$($filename$,"$r$")$ as infile:

for

line

in

infile:

for line in infile:

words

$+=$

line.split$()$

words $+=$ line.split$()$

return

words

return words

Choice $1$ of $4$:a $2$D list

Choice $2$ of $4$:a dictionary

Choice $3$ of $4$:a $1$D list

Choice $4$ of $4$:a string