Answer the questions based on following data.
The pages of a book are numbered $0, 1, 2 …$ upto $M, M >0$. There are four categories of instructions that direct a person in positioning the book at a page. The instruction types and their meanings are :
- NEW : Position the book at page No. $1$
- END : Position the book at page No. $0$
- ONWARD, $n$ :From the current page move forward by $n$ pages; if, in this process, page number $M$ is reached, stop at $M$.
- REGRESS, $n$ : From the current page, move backward by $n$ pages; if in this process, page number $0$ is reached, stop at page number $0$.
In each of the following questions, you will find a sequence of instructions formed from the above categories. In each case, let $n1$ be the page number before the instructions are executed and $n2$ be the page number at which the book is positioned after the instructions are executed.
ONWARD, $5$; REGRESS, $4$. Which of the following statements about the above instructions is true?
- $n2 = n1+4$ Provided $1 < n1 < 7$
- $n2 = n1$ provided $M < 6$
- $n2 = n1 + 1$ provided $M - n1 > 5$
- $n2 - n1 < 0$ provided $M > 0$