When preparing a client for an intravenous pyelogram (IVP), it is essential for the nurse to take which action?

Notify the healthcare provider if the client reports any allergies to iodine or shellfish.

Insert an indwelling urinary catheter prior to going to the x-ray department.

Encourage the client to drink at least 3 to 4 liters of water prior to the procedure.

Instruct the client that it will be necessary to keep the legs straight for 6 to 8 hours after the procedure.