Where was guitar originated first?

Before guitar strings are made from nylon and steel like today, strings were made by intestine of animals like....

Look at this picture of guitar diagram. Which one is the thickest string?

Which number of string is the G string?

Which number of string is the A string?

What kind of guitar is this?

Classical guitar is one kind of......

"Unlike the previous guitars, this guitar has a solid body and as such, produce very little in the way of sound unless it is plugged into an amplifier."

What is the name of this guitar?

"This guitar is thin and compact like electric guitars, but has hollow body like acoustic guitars."

What kind of guitar is that?