Two Springs,each with Spring Constant K,are Attached End to End

Multiple Choice

Two springs,each with spring constant k,are attached end to end in a series fashion.A second pair of identical springs are also attached in series fashion.Then the pair of series attached springs are attached in parallel to each other.What is the effective spring constant of the resulting combination of springs?

A) k/2
B) 2k
C) either k/4 or 4k
D) k