(b) Consider the following state diagram: (18 marks) e1 [x>0/blinkLed Led1); x++ E E entry/putrue exit/xX-5 /x-20 1x=1 65 x 201 B 04 A entry/x++; p=false e2/ D entry/x-x-5 ext/x++ 03 c H 06/blinkled Ledt) (1) Briefly explain the difference between an event, an action, and a reaction in UML state diagrams. (ii) Clearly indicate the state, the value of x, and the value of p after each event in the following sequence: system start, el, e2, 13, e2, e6, and el. (iii) Write down the number of times that Led1 blinks during the event sequence given in (ii)