plss pa sagot thanks

Answer:
1. One to one relation
2. O=(Caloocan, 1400) , (Malabon, 1470) , (Navotas, 1485) , (Valenzuela, 1440)
3. Domain: {Caloocan, Malabon, Navotas, Valenzuela}
Range: {1400, 1470, 1485, 1440}