6. Given the following declarations:

char name[21] = "Bob";

char yourName[21] = "Joe";

char studentName[31] = "Joe Bob";

Mark each of the following as valid or invalid. If invalid, explain why.

a. cin >> name;

b. cout << studentName;

c. yourName[0] = '\0';

d. yourName = studentName;

e. if (yourName == name) studentName = name;

f. int x = strcmp(yourName, studentName);

g. strcpy(studentName, name);