Question 1 Not yet answered Marked out of 1.00 Flag question Write the VHDL description to detect if a four-bit input is a valid thermometer-encoded signal. The logic equation for the valid signals have been provided in the following equation: fla3, a2, a1, a0) = (az azat) v (a3a2a1 ^ao) V (a2 ^a ^ao). What does an implementation using a logic equation imply? When would this approach not be suitable to be implemented? You are asked to implement the entity thermostat with one input and one output. a) Use concurrent dataflow signal assignment to implement the logic. b) Use case statements in concurrent selected signal assignments to implement the logic.