How can you drop a column named "age" from a data frame df?df$age <- NULLremove(df$age)df[-age]delete(df, age)

In R, you can drop a column named "age" from a data frame df using the following command:

df$age <- NULL

This command will remove the column "age" from the data frame df.

The other commands you mentioned are not correct for this task.

• remove(df$age) is not a valid command because remove() function is used to remove objects from the workspace, not to remove columns from a data frame.
• df[-age] is not a valid command because -age is not a valid index. If you want to remove a column by its index, you should use positive integer and don't forget to add comma before the index to specify that it's a column index.
• delete(df, age) is not a valid command because there is no delete() function in base R that can be used to delete columns from a data frame.