In Rust, unsafe function and block allows 3 features. Which one feature is not allowed in Rust "unsafe" ?

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Question:In Rust, unsafe function and block allows 3 features. Which one feature is not allowed in Rust "unsafe" ?

1.Call unsafe functions

2.Dereference a raw pointer

3.turn off the borrow checker

4.Access or update a static mutable variable

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  1. In Rust, unsafe function and block allows 3 features. Which one feature is not allowed in Rust "unsafe" ?
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