6 X issued a promissory note payable to the order of Y upon demand and signed and dated accordingly. X inserted a provision which says he will pay either the amount of 10,000 pesos or deliver 5 sacks of rice to Y. a. Is the note negotiable? b. Instead of the provision above, it says Y has the option to choose between being paid 10,000 pesos or be given 5 sacks of rice. Is the note negotiable in this case