Responding to the greeting during wudu: Does it invalidate the wudu?

Q: Responding to the greeting during wudu, does it invalidate the wudu? And is it disliked? Please inform us, may Allah reward you.
A: Responding to the greeting is not disliked, and it does not invalidate the wudu. So if someone greets you while you are performing the wudu prescribed by the Shari'ah, it is obligatory for you to respond to the greeting due to the generality of the evidence. However, if you are in the state of istinja' to remove impurity—because some of the common people call it wudu—then there is nothing wrong with responding to the greeting in this state, if Allah wills. This is unlike if you are relieving yourself, in which case it is better not to respond to the greeting until you are finished, and then you respond to the greeting. This is because the Prophet (peace and blessings be upon him) was greeted while he was urinating, so he did not respond until he stood up, struck the wall, performed tayammum, and then responded to the greeting, and he said: .
So the conclusion is: if a person is performing the wudu prescribed by the Shari'ah, which is washing the face, washing the hands, wiping the head, and washing the feet—this is the wudu prescribed by the Shari'ah, and some people call it tamassuh—then if someone greets him, it is obligatory for him to respond to the greeting. But if he is performing istinja', the more apparent view is that he responds to the greeting, because istinja' is neither urine nor excrement, but it involves touching impurity. If he leaves it, there is no blame on him, and if he responds, there is no blame on him.
And success is from Allah.