Exam CTFL v4.0 topic 1 question 64 discussion

Consider the following user story about an e-commerce website's registration feature that only allows registered users to make purchases:

“As a new user, | want to register to the website, so that | can start shopping online”

The following are some of the acceptance criteria defined for the user story:

[a] The registration form consists of the following fields: username, email address, first name, last name, date of birth, password and repeat password.
[b] To submit the registration request, the new user must fill in all the fields of the registration form with valid values and must agree to the terms and conditions.
[c] To be valid, the email address must not be provided by free online mail services that allow to create disposable email addresses. A dedicated error message must be presented to inform the new user when an invalid address is entered.
[d] To be valid, the first name and last name must contain only alphabetic characters and must be between 2 and 80 characters long. A dedicated error message must be presented to inform the new user when an invalid first name and/or the last name is entered.
[e] After submitting the registration request, the new user must receive an e-mail containing the confirmation link to the e-mail address specified in the registration form.

Based only on the given information, which of the following ATDD tests is MOST LIKELY to be written first?