3 Based on the neutralization practices of Switzerland, which of the followings is correct?
(A) A State may become a neutralized State via a unilateral declaration of permanent neutrality.
(B) The neutralized status of a State is guaranteed by the relevant powers via treaties.
(C) The neutralized status of a State is subject to approval by the United Nations General Assembly.
(D) A neutralized State shall not participate in any international organizations.