Rank the Following Forms of Audit Evidence from Most to Least

Rank the following forms of audit evidence from most to least reliable: observation,inquiry,confirmation,and external-internal documentation

A) External-internal documentation,observation,confirmation,and inquiry.
B) Confirmation,external-internal documentation,observation,and inquiry.
C) External-internal documentation,confirmation,inquiry,and observation.
D) Confirmation,internal-external documentation,inquiry,and observation.