The two recommended solutions for the app builder to give the users appropriate access are creating a criteria based sharing rule to all opportunities with the sales operations public group and adding a permission set with 'View All" and 'Modify All'' opportunity permissions enabled. A criteria based sharing rule can grant read and write access to all opportunities that meet certain criteria to a specified group of users. A permission set can grant additional object-level permissions to users without changing their profiles. Option B is incorrect because adding a manual share for all opportunities with each user on the sales operations team is not scalable or maintainable. Option D is incorrect because creating a criteria-based sharing rule to share all opportunities with the sales operations private group is redundant, as private groups are used to manually share records with individual users or other groups.