Explanation : In the given questions
If lists are not NULL : Invocation of join will append list m to the end of list n if the lists are not NULL.
Example:Before join operation :
n =6->7->8->9->nullAfter join operation :
& If lists are NULL : If the list n is empty and itself NULL, then joining and referencing would obviously create NULL pointer issue.
Explanation : According to Static Single Assignment
--> A variable cannot be used more than once in the LHS
--> A variable should be initialized atmost once.
Now looking at the given options
1. a – code violates condition 1 as p1 is initialized again in this statement: p1 = u * v
2. c- code is not valid as q1 = p2 * c , q2 = p4 + q3 – In these statements p2, p4, q3 are not initialized anywhere
3. d- code is invalid as q2 = p + q is incorrect without moving it to register
Therefore, option B is only correct option.