That's all what I want to say. 和That's all I want

Question

That's all what I want to say. 和That's all I want to say.哪句话是对的？

Answer 1

可以是That's all that I want to say.
也可以是That's all I want to say.(省掉了上一句的that,因为that在从句中起宾语作用，所以可以省掉）
也可以是That's what I want to say.
但不能是That's all what I want to say.（因为all that等于what。）

Answer 2

第二句对， 第一句应将what改为that，或去掉all