Translation is as follows:
I will answer the questions regarding "Where is the remote？"
A2：あそこにあります。(Asoko ni arimasu)
（It 's over there.）
→The remote is far away (unreachable distance) from the person who has asked the questions, and who is answering the question.
A4：そこにあります。(Soko ni arimasu)
（It 's there.）
→The remote is close to the person asking the question but far away (unreachable distance, but visual distance) from the person answering the question.
A6：ここにあります。(Koko ni arimasu)
（It 's here.）
→The remote is close to both the person asking and answering the question.
Think about it this way. If the remote is close to you (reachable distance) to you - what would you do? You would pick up the remote and show it/pass it to the person asking the question "Where is the remote?"
In this case, you would say:
（It 's here. This is it.）