5) Given the following declarations: signal a, b, c : std_ulogic; type state_type is (idle, req, ack); signal state : state_type; indicate whether each of the following expressions is legal as a Boolean condition, and if not, correct it: a) a and not b and c b) a and not b and state = idle c) a = 'O' and b and state = idle d) a = 'l' and b = 'O' and state = idle 5) Given the following declarations: signal a, b, c : std_ulogic; type state_type is (idle, req, ack); signal state : state_type; indicate whether each of the following expressions is legal as a Boolean condition, and if not, correct it: a) a and not b and c b) a and not b and state = idle c) a = 'O' and b and state = idle d) a = 'l' and b = 'O' and state = idle