Given a vector of structures defined by the following statements:

kit(2).sub.id = 123;

kit(2).sub.wt = 4.4;

kit(2).sub.code = 'a';

kit(2).name = 'xyz';

kit(2).lens = [4 7];

kit(1).name = 'rst';

kit(1).lens = 5:6;

kit(1).sub.id = 33;

kit(1).sub.wt = 11.11;

kit(1).sub.code = 'q';

Which of the following expressions are valid? If the expression is valid, 

give its value. If it is not valid, explain why.