Final answer:
In a 1:1 relationship, it is true that a single entity instance of one type is associated with a single entity instance of another type, which represents a direct and exclusive link between the two sets of data in a database system.
Step-by-step explanation:
In a 1:1 relationship, the statement that a single entity instance of one type is related to a single entity instance of the same or another type is True. This type of relationship is seen in databases where each record in one table is linked to one, and only one, record in another table, ensuring a direct and exclusive correspondence between the two sets of data.In a 1:1 relationship, a single entity instance of one type is related to a single entity instance of the same or another type. This statement is true.For example, let's consider a database where we have two tables: 'Students' and 'Courses'. Each student can only be enrolled in one course, and each course can only have one student. This is an example of a 1:1 relationship, where a single student is related to a single course.