Concept:
NCBI databases contain biological information such as nucleotide sequences, protein sequences, gene information, literature, and structural data. Searching effectively in NCBI requires a proper search strategy.
Step 1: Determine the type of data.
First, we decide what type of data we need, such as DNA sequence, protein sequence, gene record, or article.
\[
\text{First step} = C
\]
Step 2: Determine specific information.
After deciding the data type, we identify the specific information required.
\[
\text{Second step} = A
\]
Step 3: Determine indexed field.
Next, we decide the indexed field such as author, organism, gene name, accession number, or title.
\[
\text{Third step} = E
\]
Step 4: Link search terms using Boolean operators.
Boolean operators such as AND, OR, and NOT are used to combine search terms.
\[
\text{Fourth step} = D
\]
Step 5: Create the search item.
Finally, the complete search query is created and entered into the NCBI search box.
\[
\text{Fifth step} = B
\]
Therefore, the correct sequence is:
\[
C, A, E, D, B
\]
\[
\therefore \text{Correct Answer is (A)}
\]