A 28-year-old primigravida at term presents in active labour. After 2 hours of pushing in the second stage, the fetal head is at +2 station in the left occipitoanterior (LOA) position. Maternal vital signs are stable, fetal heart rate is 140 bpm with normal variability. The obstetrician decides to perform an assisted vaginal delivery. Which of the following is the MOST appropriate instrument and technique for this clinical scenario?