一句简单中文翻译成英语，请高手指教

Mr. Wang promised to give a definite answer by October 19.

Mr.Wong will reply by 19th Oct.
Mr.Wong will acknowledge by 19th Oct.
Mr.Wong promised to reply by 19th Oct.
Mr.Wong promised to acknowledge by 19th Oct.

simply pick one

王先生答应在十月19号之前给出确切的答复。

Mr. Wang should give an exact answer/reply before October 19th.

Mr. Wang agree to reply it with exact explanation before 19th of October.

Mr.Wang promised to give a right decision before Ootober 19.

Mr. Wong promised to give a definite reply before 19th October.