An Omani farmer produces wheat and sells to a flour miller for 30 RO who grinds wheat to make flour and sells to Muscat Bakery for 40 RO. Muscat Bakery makes bread and sells to consumers for 50 RO. In this situation which value will be included in the calculation of national income? O a. All the options O b. 40 RO c. 30 RO d. 50 RO