Concept: Catalogue codes and bibliographic standards developed over time to standardize library cataloguing.
Step 1: Start with Vatican Code.
Vatican Code is the earliest among the given options.
\[
D = \text{Vatican Code}
\]
Step 2: Place CCE next.
Classified Catalogue Code came after Vatican Code.
\[
B = \text{CCE}
\]
Step 3: Place MARC.
MARC was developed later for machine-readable cataloguing.
\[
A = \text{MARC}
\]
Step 4: Place ISBD.
ISBD was developed to standardize bibliographic description.
\[
C = \text{ISBD}
\]
Step 5: Place AACR-II.
AACR-II came after these developments.
\[
E = \text{AACR-II}
\]
Thus, the correct order is:
\[
D,\ B,\ A,\ C,\ E
\]