Which of the following is $($are$)$ not part of the Principal of Easiest Penetration $($select all correct answer$($s$)$

Any means of penetration of a system may be used by an attacker

Attempts to penetrate a system may not be by the most obvious means

Penetration attempts will always be made through windows rather than doors.

Penetration of a system may not be attempted against the area that has the strongest defense

Penetration attempts will always come through the area that has the weakest defense.