Vbac for twins

Hi guys !!

Please i study x cpc test a question about the vbac code x twins,

problem:

26 year old gravida 2 para 1, 36th week of pregnancy with twin gestation monochorionic and monoamniotic.

Pt had previous cesarean during first pregnancy, physician allowed her to attempt vaginal birth.

After 3 hours pt exhausted taken to the or x cesarean delivery. Two healthy newborns were born. Same physician provided postpartum care to the mother.

There are three different answers on it. Which one is it? Why???

1- 59618-22 .....

2- 59618, 59618-51 .....

3- 59618, 59620-51 .....

Thanks x some help

Vbac for twins