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?

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.

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

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