Difference between 'const char*' and 'char* const'

When used with variables, the const keyword in C++ specifies that the value of the variable cannot be changed after initialization. However, the position of the const keyword matters in a pointer's declaration.

We have 2 char arrays:

char hello[] = "Hello";
char world[] = "World";

Let's initialize 2 pointers to above arrays. Note that one is const char* and the other is char* const:

const char* ptrHello = hello;    
char* const ptrWorld = world; 

Choose all the operations below that are valid (check Explanations for explanation of correct answer):