Amongst which of the following is / are not correct to access individual item from dataframe 'df'df.iat[2,2]df.loc[2,2]df.at[2,2]df[0,0]

The correct ways to access individual items from a dataframe 'df' are:

1. df.iat[2,2]: This is used to get a value at particular position specified by integer index only. Here, it will return the value at the 3rd row and 3rd column (indexing starts from 0).

2. df.at[2,2]: This is used to retrieve the value at the passed column and index. Here, it will return the value at the 3rd row and 3rd column (indexing starts from 0).

The incorrect ways are:

1. df.loc[2,2]: This is incorrect because df.loc[] is primarily label based indexing. Integers may be used but they are interpreted as a label.

2. df[0,0]: This is incorrect because it's not a valid syntax to access elements in the dataframe. You can access the elements using methods like loc, iloc, at, iat etc.