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What preventable actions can cause a hematoma at the end of a venipuncture?
1. Removing the needle before removing the tourniquet.
2. Applying pressure until the bleeding has stopped, about 2 to 3 minutes.
3. Bending the elbow to apply pressure.
4. Having the patient hold their arm in a raised, outstretched position.

O 3 and 4.
O 1 and 2 .
O 2 and 4.
O1 and 3.