CTFL_SYLL_4.0 Question #137: Real Exam Question with Answer & Explanation

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, I want to register to the website, so that i 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?