Consider the below data set for carrying out some data science activity. There are four columns identified by f1,f2,f3,f4 ("f" means feature). In the table "NA" means "Not Available" (or missing value). Your task as a data scientist is to obtain the missing values using some imputation technique. The domain expert gave advice that f3 can be imputed using mean and f4 can be imputed using median. Write the steps to be followed to obtain the missing values and identify the missing values. [4 marks]