The Flow of Information in the LGN Is Best Described

The flow of information in the LGN is best described as

A) unidirectional, with signals going from the retina to the LGN.
B) unidirectional, with signals going from the LGN to the retina.
C) unidirectional, with signals going from the LGN to the cortex.
D) bi-directional, with signals coming from the retina and the cortex to the LGN.