Which new form of Buddhism, with Buddha statues and Bodhisattvas, developed around Kanishka's time?

1. Earlier the Buddha was shown only by signs like the peepal tree. 2. Mahayana Buddhism introduced statues. 3. Bodhisattvas stayed in the world to help others. _Source: syllabus Our Pasts I, Chapter 9, Traders, Kings and Pilgrims._