-6 Consider the following statement struct dateType struct nameType ed struct personal InfoType out of string first string last; int month; int day: int year: nameType name: int PID: dateType dob: question }; personalInfoType person; personal InfoType classList (100); nameType student : Which of the following statements is VALID: Select one: O a. person. firstName - "William"; O b. person.name. first = "William": O c. person. firstName - William ; O d. person.name. first = "William