Which of the following statements best describes the relationship between intrinsic factor and vitamin B12?

Intrinsic factor is necessary for the absorption of vitamin B12 in the ileum.

Intrinsic factor aids in the conversion of vitamin B12 to its active form.

Intrinsic factor is required for the excretion of vitamin B12 in the kidneys.

Intrinsic factor enhances the synthesis of vitamin B12 in the liver.