xamine the following four lines of code.

string firstName;

char lastName;

firstName $=$ "Abraham";

lastName $=$ "Lincoln";

a$.$ None of the $4$ lines of code are correct.

b$.$ The third line is incorrect.

c$.$ The third and fourth lines are incorrect.

d$.$ The fourth line is incorrect.

e$.$ All of the $4$ lines of code are correct.

c$.$ stream extraction $>>$

d$.$ either the stream insertion or the stream extraction $<<$ or $>>$