Assigning Absolute Configuration to 3-D Representations

 

c
b
a
d
What is the Priority at Position a ?
1 2 3 4
What is the Priority at position b ?
1 2 3 4  
What is the Priority at position c ?
1 2 3 4
What is the Priority at position d ?
1 2 3 4
What is the Absolute Configuration?
R S Achiral