SQLite onUpgrade with 4 database versions

How is the proper way to execute an SQLiteOpenHelper's onUpgrade method, when we have 4 database versions and we have added a new field to the user table in each version?

Variant A: // No "break" after each case, does it keep running for case 2 and 3?

public void onUpgrade(SQLiteDatabase database, int version_old, int current_version) {
    switch (version_old) {
    case 1:
        database.execSQL(addPostcodeFieldToUserTable);
    case 2:
        database.execSQL(addGenderFieldToUserTable);
    case 3:
        database.execSQL(addEmailSubscriptionFieldToUserTable);
        break;
    }
}

Variant B:

public void onUpgrade(SQLiteDatabase database, int version_old, int current_version) {
    switch (version_old) {
    case 1:
        database.execSQL(addPostcodeFieldToUserTable);
        break;
    case 2:
        database.execSQL(addPostcodeFieldToUserTable);
        database.execSQL(addGenderFieldToUserTable);
        break;
    case 3:
        database.execSQL(addPostcodeFieldToUserTable);
        database.execSQL(addGenderFieldToUserTable);
        database.execSQL(addEmailSubscriptionFieldToUserTable);
        break;
    }

But what do we do in the case when a user had version 1 of the DB, then missed version 2 and upgraded the app with version 3?

Variant 3:

public void onUpgrade(SQLiteDatabase database, int version_old, int current_version) {
    if(version_old==1 && current_version==2) {
        database.execSQL(addPostcodeFieldToUserTable);

    } else if(version_old==2 && current_version==3) {
        database.execSQL(addGenderFieldToUserTable);

    } else if(version_old==3 && current_version==4) {
        database.execSQL(addEmailSubscriptionFieldToUserTable);

    } else if(version_old==1 && current_version==3) {
        database.execSQL(addPostcodeFieldToUserTable);
        database.execSQL(addGenderFieldToUserTable);

    } else if(version_old==1 && current_version==4) {
        database.execSQL(addPostcodeFieldToUserTable);
        database.execSQL(addGenderFieldToUserTable);
        database.execSQL(addEmailSubscriptionFieldToUserTable);

    } else if(version_old==2 && current_version==4) {
        database.execSQL(addGenderFieldToUserTable);
        database.execSQL(addEmailSubscriptionFieldToUserTable);

    }
}