The relationship between char array and C-style string is [ ]
A.
If a string is stored in a char array, the size of the char array may be NOT greater than the length of the C-style string.
B.
If a string is stored in a char array, the size of the char array must be greater than the length of the C-style string.
C.
The string can be stored only in char array.
D.
After defining a char array, the size of the array can be changed according to the length of the C-style string.