Exam CIPT topic 1 question 99 discussion

After downloading and loading a mobile app, the user is presented with an account registration page requesting the user to provide certain personal details. Two statements are also displayed on the same page along with a box for the user to check to indicate their confirmation:
Statement 1 reads: `Please check this box to confirm you have read and accept the terms and conditions of the end user license agreement` and includes a
hyperlink to the terms and conditions.
✑ Statement 2 reads: `Please check this box to confirm you have read and understood the privacy notice` and includes a hyperlink to the privacy notice.
Under the General Data Protection Regulation (GDPR), what lawful basis would you primarily except the privacy notice to refer to?