Is the subquery in the following query correlated or uncorrelated? If correlated, which reference causes the query to be correlated?

SELECT

PATIENT.PAT$\_$ID

FROM

PATIENT

WHERE NOT EXISTS

$($ SELECT $1$

FROM PAT$\_$ENC

WHERE

PATIENT.PAT$\_$ID $=$ PAT$\_$ENC.PAT$\_$ID

AND PAT$\_$ENC.ENC$\_$TYPE$\_$C $=101)$

T ONE OF THE FOLLOWING $(3$ PTS$)$

A$.$ Uncorrelated

B$.$ Correlated, because the outer query references PATIENT.PAT$\_$ID$,$ which is part of the subquely

C$.$ Correlated, because the subquery references PATIENT.PAT$\_$ID$,$ which is part of the outer query

D$.$ Correlated, because the outer query references PAT$\_$ENC.PAT$\_$ID$,$ which is part of the subquery

E$.$ Correlated, because the subquery references PAT$\_$ENC.PAT$\_$ID$,$ which is part of the outer query