Answer: K is a key for some other relation.
Explanation:
If K is a foreign key in relation R 1, then K is a key for some other relation as foreign key is the key which provide index relation table. It basically declared index of one table are related to another and place the constraint. And in the relation operator that comprises its value from all the rows in the table and it is used to prevent from destroy between the tables.
The K is a key for some other relations. Thus the option C is correct.
The foreign key is the Colum of the group of columns that are found in a relational database table and gives us a link in two sets of variables. It acts as a cross references between the two tables.
Thus joins the primary and secondary table. Thus key consists of set of attributes in relation to the database. If K is the foreign key in relation to R 1, then K is the key for some other relation as a foreign key.
Find out more information about the foreign key.
brainly.com/question/18519349.
