A testator may execute a holographic will instead of an ordinary will. Which among the following statements pertaining to holographic will is false?
I. A person may execute a holographic will which must be entirely written, dated and signed by the hand of the testator himself
II. A holographic will is subject to no other form, and may be made within or outside of the Philippines, and need not be witnessed
III. In case of an insertion, cancellation, erasure or alteration in a holographic will, the testator must authenticate the same by his full signature