In every C++ program: Select all that apply

Question

which can apply guys?Variables names should be either x or y
There must be a function named main
There must be at least two declared variables
Each variable must have its data type

Answer 1

There must be a function named main.
Each variable must have its data type.

Answer 2

In every C++ program:
*There must be a function named main
*Each variable must have its data type

Answer 3

Each variable must have its data type
There must be a function named main

Answer 4

Each variable must have its data type
There must be a function named main

Answer 5

In every C++ program:

Answer:

There must be a function named main
Each variable must have its data type

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Answer 6

int x = 81;
int y = 3;

<< x

+

y << endl;