$7.$ Small$-$String Optimization

What is the small$-$string optimization in C$++?$

Pick ONE option

constant

a faster implementation of certain Standard Library algorithms that is used when the length of a string is under some

$4$

a feature of modern linkers whereby "short" strings are placed in a special segment of memory that is physically closer to the program's instruction stack

$6$

that fact that only one copy of a string literal is stored in memory even if the same string literal is used multiple times throughout a program is

$7$

the fact that, for strings of sufficiently few characters, std:string does not require any heap$-$allocated memory

$8$

the fact that converting a stdstring to a std::string$\_$view $($in C$++17$ and later$)$ has average time complexity O$($N$)$ in the length of the string, and is therefore more efficient for shorter strings