If Users Access Only Certain Fields in a Table, How

Multiple Choice

If users access only certain fields in a table, how can you improve performance?

A) by splitting the table into two or more tables and removing the primary key
B) by combining the table with another table that performs better
C) by splitting the table into two or more tables that each has the same primary key as the original
D) by adding indexes to each column and deleting the primary and alternate keys