An Infant Is in the Hospital for Hypernatremia

An infant is in the hospital for hypernatremia.Which of the following is the most appropriate means of collecting urine for a specific gravity test?

A) Placing cotton balls in the diaper and then (wearing gloves) squeezing a drop of urine from the cotton balls onto the specific gravity test strip
B) Performing a sterile in-and-out catheterization to collect urine for the specific gravity test strip
C) Placing a urine collection bag on the infant
D) Inserting a Foley catheter to obtain a sterile urine specimen for the specific gravity test strip