Question: Which sed options should you use to change the second-to-last instance of variable to rock so it would read:

1. s/\(.*\)variable\(.*variable\)/\1rock\2/'
2. s/variable/rock/'
3. s/variable/rock/g'
4. s/(.*\)variable\(.*variable\)/\1rock\2/'

Answer: The correct answer of the above question is Option A:s/\(.*\)variable\(.*variable\)/\1rock\2/'