C++ lvalues, rvalues, references, parameters, and performance

So I have a function that needs to take an std::vector as a parameter. I'd like to know the best way to declare the parameter so that the underlying array is not deep-copied, as it could be rather large.

// which should I choose?
void myFunc(std::vector<char>); // 1
void myFunc(std::vector<char>&); // 2
void myFunc(std::vector<char>&&);  // 3
void myFunc(std::vector<char>*) // 4

Which should I choose? Also, I won't be modifying the vector in the function so shouldn't I add const? Should I overload the function and have a combination of these?