The Following 4 Lines of C++ Code, Use Strings

The following 4 lines of C++ code, use strings. string firstName; // Define a string object
Char lastName[7]; // Define a C-string
FirstName = "Abraham"; // Assign a value to the string object
LastName = "Lincoln"; // Assign a value to the C-string
Which of the following statements is /are True?

A) The string object is defined incorrectly because no size is given for it.
B) The 2 string definitions are correct, but the 2 assignment statements are wrong.
C) The string object is assigned a value correctly, but the C-string is not.
D) The C-string is assigned a value correctly, but the string object is not.
E) All 4 lines of code are correct.