Yes, coming to your answer clustered index is used and applied only and primary keys

For example if a table student is created consider here in this table student id is the primary key so clustered index is applied on the student id column.

Coming to non-clustered index consider other table employee table here employee id is the primary

Key and it is foreign key for student table and there may be more than one foreign key so non-clusterd index is applied on foreign key? and candidate keys.

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