An algorithm will output the last three lines from a text file Result.txt The lines need to be output in the same order as they appear in the file. Assume: • Three variables LineX, LineY and LineZ will store the three lines. These are of type string and all three variables have been initialised to an empty string. • The file exists and contains at least three lines.

1. (a)The algorithm to output the lines is expressed in eight steps. Complete the steps. 1. Open the file 2. Loop until 3. 4. Assign LineY to LineX 5. Assign LineZ to LineY 6. Assign ThisLine to LineZ 7. After the loop, 8. Output LineX, LineY, LineZ and store in ThisLine[4]
2. (b)Explain the purpose of steps 4, 5 and 6 in the algorithm from part (a).[1]
3. (c)The requirement changes, and the algorithm will now output three lines from the file, starting from a given line number. The modified algorithm will be implemented as a function which will: • be called with an integer parameter representing the given line number • output three lines, starting at the given line • return TRUE if the 3 lines are output, or FALSE if it was not possible to output the 3 lines. Describe the changes that need to be made to steps 2 to 8 of the algorithm given in part (a).[4]