How should an administrator fulfil this request?

Northern Trail Outfitters is using one profile for all of its marketing users, providing read-only access to the Campaign object. A few marketing users now require comprehensive edit access on Campaigns.

How should an administrator fulfil this request?
A . Permission sets
B . Organization-wide defaults
C . Marketing user checkbox
D . Field-level security

Answer: A

Explanation:

Permission sets are used to grant additional permissions and access settings to individual users without changing their profiles or requiring a new profile to be created. You can use permission sets to extend users’ functional access without changing their existing profiles. To meet the request of giving comprehensive edit access on Campaigns to a few marketing users who have read-only access by default, you need to create a permission set with edit access on Campaigns and assign it to those users.

Reference: https://help.salesforce.com/s/articleView?id=sf.perm_sets_overview.htm&type=5