3. A new type of keyboard is being developed with the same functionality as a regular QWERTY keyboard. However, the newly developed will have reduced number of keys. Given below are some key combinations that will map to a character in this keyboard: K1 + K4+ K6 = A K2 + K5 + K3 = B K2 + K5 = C K2 = D Which of these digital circuit elements can be used to implement this keyboard ? a) Multiplexer b) Demultiplexer c) Priority Encoder d) Decoder 3. A new type of keyboard is being developed with the same functionality as a regular QWERTY keyboard. However, the newly developed will have reduced number of keys. Given below are some key combinations that will map to a character in this keyboard: K1 + K4+ K6 = A K2 + K5 + K3 = B K2 + K5 = C K2 = D Which of these digital circuit elements can be used to implement this keyboard ? a) Multiplexer b) Demultiplexer c) Priority Encoder d) Decoder