Which of the following is cited correctly in APA style?1. H. M. Dietel and P. J. Dietel define pointers as "variables that contain as their values addresses of other variables" (1999, p. 294).2. H. M. Dietel and P. J. Dietel (C How to Program) define pointers as "variables that contain as their values addresses of other variables" (p. 294).3. H. M. Dietel and P. J. Dietel (1999) define pointers as "variables that contain as their values addresses of other variables" (p. 294).