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In Oracle, retrieves the current value of a sequence. Select one: : a. NEXTVAL O b. CURRVAL C. VARCHAR2 O d. VARCHAR The constraint assigns a value to an attribute when a new row is added to a table. Select one: a. NOT NULL O b. DEFAULT C. CASCADE O d. UNIQUE SQL requires the use of the command to enter data into a table. Select one: a. NOT NULL O b. INSERT C. SELECT d. COMMIT The command permanently saves all changes-such as rows added, attributes modified, and rows deleted-made to any table in the database. Select one: a. COMMIT b. ROLLBACK c. UPDATE O d. SELECT