Question: #ifndef SHAPE _ H _ is called a header guard. Select all of the TRUE statements about header guards. Header guards speed up the compilation

#ifndef SHAPE_H_
is called a header guard. Select all of the TRUE statements about header guards.
Header guards speed up the compilation process.
The Google style guide covers how to write header guards.
Every .cc file should contain a header guard.
Header guards prevent dynamic runtime errors.
Every .h file should contain a header guard.
A missing header guard always causes a compile error.
Header guards prevent multiple-declaration compile errors.

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