Which of the following best describes the anatomical connectivity of prefrontal cortex to the rest of the brain? a) Most of the connections to prefrontal cortex originate from the primary sensorimotor areas (V1. A1, S1 and M1). b) Most of the inputs to prefrontal cortex originate from subcortical structures such as the thalamus and pulvinar, rather than from higher order cortical areas. c) There are extensive connections between prefrontal cortex and the rest of brain, with more posterior connections to sensorimotor areas and more anterior connections to "association" areas. d) Most of the connections in prefrontal cortex originate from within the frontal lobe, and most of the outputs stay within the frontal cortex.