Who are the citizens of the Philippines?

Section 1, Article IV of the 1987 Constitution reads:

Section 1. The following are citizens of the Philippines:

(1) Those who are citizens of the Philippines at the time of the adoption of this Constitution;

(2) Those whose fathers or mothers are citizens of the Philippines;

(3) Those born before January 17, 1973, of Filipino mothers, who elect Philippine citizenship upon reaching the age of majority; and

(4) Those who are naturalized in accordance with law.