8. What is the difference between SIGNAL and VARIABLE? (a) The value of SIGNAL never varies whereas VARIABLE can change its value (b) SIGNAL can be used for input or output whereas VARIABLE acts as intermediate signals (c) SIGNAL depends upon VARIABLE for various operations (d) SIGNAL is global and VARIABLE is local to the process in which it is declared 9. Look at the following declarations: TYPE array IS ARRAY (OTO 3 ) OF BIT VECTOR (3 DOWNTO 0); Scanned with 36. ... Ota 65% 19:01 7. Which of the following option is completely legal, given that a and b are two UNSIGNED type signals? (a) X = 1 + b: y = ab: (b) x