A time study of a manufacturing operationyielded the following times for one element of a jobfor which the analyst gave a performance rating of 1.17.Using an allowance of 20 percent work time, determine the appropriate standard time for this operation. Observation Timex (minutes) Observation TIme, x(minutes) 1 1.16 7 1.14 2 1.19 8 1.16 3 1.2 9 1.18 4 1.13 10 1.12 5 1.17 11 1.18 6 1.13 12 1.16 Determine Normal Time (NT).a) 1.16 minutes b) 1.30 minutes c) 1.36 minutes d) 1.45 minutes e)None of the above