For which type of event are notifications and alerts generally NOT sent?

Which statement is true?

A. Stored functions can increase the efficiency of queries by performing functions in the query rather than in the application. B. Stored functions can be called from the SELECT and WHERE clauses only. C. Stored functions cannot manipulate new types of data, such as longitude and latitude. D. Stored functions do not permit calculations that involve database links in a distributed environment.

In array items, which expression below accesses the value at row 3 and column 4?

a. items[3].[4] b. items[3[4]] c. items[3][4] d. items[3, 4]