Some Index Funds Modify the Index Matching Strategy to Boost

Some index funds modify the index matching strategy to boost performance.Such strategies do NOT include the following:

A) investing dividend income to buy stocks in the same proportion as in the index as soon as they arrive
B) buying futures instead of stocks when futures are cheaper
C) picking up extra income by lending securities
D) temporarily holding a bit more of a thinly traded stock than is called for in a benchmark
E) buying stocks being added to an index in advance of the effective date of those changes