Discover the answers you need at Westonci.ca, where experts provide clear and concise information on various topics. Explore a wealth of knowledge from professionals across various disciplines on our comprehensive Q&A platform. Explore comprehensive solutions to your questions from knowledgeable professionals across various fields on our platform.

Who described personal characteristics at three levels: cardinal traits, central traits, and secondary traits?
a. Gordon Allport
b.John Holland
c. Isabel Briggs Myers
d. Carl Rogers