Which of the following accurately states the status of harmless error doctrine in California?
a) It will permit oral wills if there is clear and convincing evidence of the testator's intent.
b) It potentially will excuse any defects in witness attestation.
c) It will excuse a failure of testator signature if the testator's intent that the document be his will is established by a preponderance of the evidence.
d) A holographic will is valid only if it substantially complies with requirements for formal wills.