An extended definition.
An extended definition is one or more paragraph that further explain the meaning of the subject matter. It allow the writer to completely define and explain the subject matter by using his own words or sentence so as to further buttress on it and supply more information for easy understanding.
From the paragraph, Generally, however, the term robot refers to any machine that is able to perform a complex task on its own, but whose actions or tasks are controlled by human programming.” It further explain and define Robots.
The artists create beautiful pictures.the artists have created beautiful pictures. the artists will create beautiful pictures.the artists are creating beautiful pictures.the answers are it considers humanity and survival, it shows the results of a disastrous event, it occurs after the end of one world or society.
all post-apocalyptic fiction happens after civilization has collapsed but it can be because of climate events, resource depletion, pandemics, etc. not just technology.
the answer is echo i believe.