You are coding a survey that asks the question "Please tell us your age: $q,,$ where the respondent fills in the blank with a number corresponding to his or her age. The best way to code this information is

using narrow categories, such as the following: Under $18,19-21,22-25,26-29,30-33,$ etc.

recording the actual age.

using broad categories, such as the following: Under $20,20-29,30-39,40-49,$ etc.

None of these are correct.

All of these are correct.