Data anonymization aims to protect privacy by removing sensitive information. Which of the following best describes a technique used in data anonymization?

$1$ point

Storing all data in its original format but requiring high levels of user authorization for access.

Merging all data sets into a single, large database for easier analysis.

Using a de$-$identification technique like replacing a person's name with a random alphanumeric code.

Allowing public access to anonymized datasets while keeping the original data secure$.$