Based on the code: df$[\text{'}$Salary$\_$m$\text{'}]=$ df$[\text{'}$Salary$\text{'}].$isnull$().$astype$($int$),$ what will be the result in the 'Salary$\_$m$\text{'}$ column when there is a missing value in the 'Salary' column?

Question $1$ options:

True

$1$

False

'Missing'

$0$

NaN