You have opened a csv file with comma separated integer data. The opened file is intended to be read, and is being stored in the variable ET$.$

Which code will create a single list of all values converted to integers?

If you believe that more than one answer applies choose the best answer.

aliens $=[]$

for alien in ET:

alien $=$ alien.rstrip $()$

$a=$ alien.split$()$

for $b$ in range$($len$($alien$))$:

$a[b]={\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}(a[b])$

aliens.append $($a$)$

aliens $=[]$

for alien in ET:

alien $=$ alien.rstrip $()$

$a=$ alien.split$(",")$

for $b$ in range$($len $(a)$ :

$a[b]={\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}(a[b])$

aliens.append $($a$)$

aliens $=[]$

for alien in ET:

alien $=$ alien.rstrip$()$

$a=$ alien.split $(",")$

for $b$ in range$($len$($a$))$:

$a[b]={\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}(a[b])$

aliens.append$($alien$)$