Question from the Rust test

1. The pointer to the address of the string in the heap.
2. The maximum buffer capacity.
3. The current length of the character string.

1. The pointer to the start address of the string in the heap.
2. The pointer to the end address of the string in the heap.
3. The maximum buffer capacity.

1. The pointer to the start location of the string in the stack.
2. The pointer to the end location of the string in the stack.
3. The maximum buffer capacity.

The std::string type is defined by two fields, not three:

1. The current length of the character string.
2. The pointer to the address of the string in the heap.