graph of the function

This is the graph of the "floor" function shifted to the right by one unit

The "floor"  is defined as the greatest integer less than or equal to x

So...for example

Floor (2.4)  =  2

Floor  (3)  = 3

Floor (-1/2) = -1

So....let x =  2.5

So

Floor (2.5 - 1)  = Floor (1.5)  =  1

So....the point (2.5, 1)   is on the graph

Note that this point is on the graph at the top left......so....this is the correct graph