One can tolerate frustration because of the function of?

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E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 2980-2982
E6 Psychology Baron Misra 5e Part 2 p. 84-86
E6 Psychology Applied Sreevani 6e Sem1 p. 70-72
Practise the full HPSSC Staff Nurse - 2021
Attempt every question from this paper in a timed mock, then review the full solution for each one.