A Privacy Engineer Reviews a Newly Developed On-Line Registration Page

A privacy engineer reviews a newly developed on-line registration page on a company's website. The purpose of the page is to enable corporate customers to submit a returns / refund request for physical goods. The page displays the following data capture fields: company name, account reference, company address, contact name, email address, contact phone number, product name, quantity, issue description and company bank account details. After her review, the privacy engineer recommends setting certain capture fields as "non-mandatory". Setting which of the following fields as "non-mandatory" would be the best example of the principle of data minimization?

A) The contact phone number field.
B) The company address and name.
C) The contact name and email address.
D) The company bank account detail field.