In reference to the probate process, which of the following statements is correct?

a. The personal representative of the deceased can file a petition with the appropriate probate court requesting that an existing will be probated.

b. The Uniform Probate Code varies from state to state.

c. The Uniform Probate Code is applied to all wills found to be valid, and to wills found to be invalid in probate court.

d. The Uniform Probate Code is applied to all wills found to be valid, but not to wills found to be invalid in probate court.