The city has been divided into 4 blocks. Block 1 in the north and Block 4 in the east of the city.
Four Blocks image
A postman, who delivers the letter in the city is standing at the intersection of the two lines. The postman travels the city in the following order:

1. North-West 20 steps
2. South-West 30 steps
3. South-East 40 steps
4. North-East 50 steps
5. North-West 15 steps 
Now, find the location where the postman is standing?
A: Block 3
B: Block 2
C: Block 4
D: Block 1
E: On the line intersecting Block 1 and Block 4
F: On the line intersecting Block 3 and Block 4