True statement concerning placenta pre is

The initial haemorrhage in placenta pre is usually painless and rarely fatal.If the fetus is premature and if haemorrhage is not severe, vaginal examination of a woman suspected of having placenta pre frequently can be delayed until 37 weeks gestation; this delay in the potentially hazardous examination reduces the risk of prematurity, which is often associated with placenta pre.Vaginal examination, when needed to determine whether a low-lying placenta is covering the internal os of the cervix, should be performed in an operating room fully prepared for an emergency cesarean section (i.e., a double setup).Increasing maternal age and multiparity are associated with a higher incidence of placenta pre.