The four plans of St. Peter’s Basilica which is represented in the image below is:
This refers to the first stage of planning which was done for St. Peter's Basilica as a religious building for the Vatican.
From the complete text, we can see that there is an image which depicts the plan of Bramante where he made a proposal about a centrally placed worship center in the shape of a Greek cross.
Read more about Bramante's Plan here:
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