ART. 1199. A person alternatively bound by different prestations shall completely perform one of them. The creditor cannot be compelled to receive part of one and part of the other undertaking. (1131)

Things to remember in an alternative obligation:
a) of the two or more prestations, several are due;
b) may be complied with by performance of one of the prestations which are alternatively due;
c) the right of choice belongs to the debtor, unless it has been expressly granted to the creditor;
d) loss/impossibility of all prestations due to a fortuitous event shall extinguish the obligation;
e) loss/impossibility of one of the prestations does not extinguish the obligation; and
f) culpable loss of any of the objects alternatively due before the choice is made may give rise to liability on the part of the debtor.
[1] 8 Manresa 176.