[JJD]

Hi everyone. I'm a new member from Tokyo. My TOIEC score is 890.
Here is my first question...
Situation: I got a technical question from our customer Mr. Richard by email. Because I'm not in the right position, I want to ask(by email) my colleague to reply it. What is the best sentence to ask my colleague to reply the question?
My thoughts are as follows.
1. Could you answer the question from Mr. Richard?
2. Could you take care of the question from Mr. Richard?
3. Could you reply the question from Mr. Richard?
4. Could you work on this issue?
5. Could you follow this issue?
6. Could you handle this issue?
My colleague may reply "We will study and come back later".
Can you call it an answer?
I think it is a reply but not an answer.
In this sense I don't want to use No.1 because I don't want to push my colleague to provide exact answer. I think it's up to my colleague for the quality of the reply. Do you think my concern about "answer" makes sense?