When cleaning data, sometimes we need to remove a column from our dataframe. Which of the following functions will permanently drop the "adj close" column from our "returns" dataframe?

returns.drop$([\text{'}$adj close'$])$

returns $=$ returns.drop$(\text{'}$adj close'$)$

df$.$drop$([\text{'}$column$\text{'}])$

returns.drop$([\text{'}$adj close'$],$ inplace$=$True$)$