During Low Visibility Procedures (LVP) at a controlled aerodrome, why must all aircraft and vehicles be held outside the ILS Critical and Sensitive Areas?

1. To prevent jet engine noise from reaching airport terminal lounges
2. To prevent physical damage to the runway edge lights by vehicle tires
3. To prevent multipath radio signal interference, scattering, or distortion of the ILS localizer and glide path guidance beams transmitted to approaching aircraft
4. To ensure that fire rescue vehicles have unobstructed access to the passenger apron