Programming languages use ________ which are similar to grammar rules

For this iterator which of the following is correct? If correct what does the expression produce?

Suppose we have the following definition: ``` vector vec; // use push_back to put 10 values into vec here. vector::iterator itr1, itr2,itr3; itr1 = vec.begin(); itr2 = vec.begin() + 5; itr3 = vec.end(); ``` a) ``` *iter1 ``` b) ``` itr2[3] ``` c) ``` itr + 3 ``` >>>there is no itr, Do you mean itr3? d) ``` itr – 3 ``` e) ``` itr3 – itr1 ``` (if valid, what does this produce?) >>You asked for what is produced for all of them in intro to question

What is anchor view?

A - Same as list view B - provides the information on respective relative positions C - Same as relative layout D - None of the above