The variable Address2 contains values such as Piscataway, NJ. How do you
assign the two-letter state abbreviations to a new variable named State?
a. State=scan(address2,2);
b. State=scan(address2,13,2);
c. State=substr(address2,2);
d. State=substr(address2,13,2);
为什么答案一定要是A，而不是D啊？