You arrive on the scene and find a 6-year-old weighing 44 lb…

Yоu аrrive оn the scene аnd find а 6-year-оld weighing 44 lbs. with a heart rate of 240, a palpable weak radial pulse, and an RR of 30. The child is alert and anxious, with dizziness and chest pain. An IV is established, and O2 via NRM is being provided. The cardiac monitor shows SVT. According to REMSA policy 4403, which of the following appropriate treatments require BHO :