The nurse is teaching a client with early osteoporosis the importance of including vitamin D with calcium supplements. Which information is most important for the nurse to provide to encourage the client's compliance in the management of progressing osteoporosis?

Avoiding the use of sunscreen is important for adequate vitamin D synthesis.

Vitamin D combined with calcium is balanced with phosphorus for absorption for strong bones.

Calcium uses vitamin D that is produced in the skin by exposure to sunshine.

Adding daily Vitamin D with oral calcium supplements promotes absorption of calcium into bone.