When assessing whether a competency passes the inimitable $($not copyable$)$ element in the VRIO test you should make use of Barney's $(1991$ and $1995)$ reasons why a resource many be difficult to copy. The reasons Barney gives are:

$($Select ALL that apply$)$

a$.$

Social Complexity

b$.$

The cost

c$.$

The presence of a patent

d$.$

Historic Circumstances

e$.$

Causal Ambiguity $($Numerous small decisions$)$