After college, Jones spent his 20s pursuing career goals. He worked long hours to advance quickly. He drives a nice car, owns a house in a nice neighborhood, and is able to afford luxurious vacations. As he turns 30, Jones recognizes that he needs to allow himself time to relax, meet new friends, and potentially meet someone to marry. As Jones turns 30, he is attempting to fulfill what level of Maslow's hierarchy of needs?