Kaplan Practice Question! Need Help

I don't really understand the rationale in this question.

The nurse on the medical/surgical unit administers digoxin 0.125 mg by direct IV. During the administration of the digoxin, the unit secretary informs the nurse that a client with extensive head and facial injuries has arrived on the unit. Which of the following actions should the nurse take FIRST?

1.Note the time and place the syringe with the remaining medication on the medication cart.

2.Instruct the unit secretary to find another nurse to admit the client.

3. Ask the unit secretary to obtain the sheet containing the staff's pager numbers.

4.Request that the LPN continue the administration of the medication.

Strategy: "FIRST" indicates priority.

1) nurse is responsible for administering medication; cannot administer medication that is not under the constant supervision of the nurse

2) inappropriate delegation; nurse's responsibility to determine the appropriate person to admit the client

3) CORRECT-- enables nurse to safely administer the medication, and nurse determines the appropriate person to care for the clients; when administering digoxin by direct IV, infuse over a minimum of 5 minutes; use diluted solution immediately; observe IV site; extravasation can lead to tissue irritation and sloughing

4) nurse is responsible for administering the medication

Are we allowed to administer medications while paging other nurses? And also, regarding answer number 2, how come other nurses not appropriate to admit the patient?

Thanks in advance, all answers will be appreciated.