What is out-of-order execution?

A.
A feature of certain processors, where instructions are processed based on the availability of
data.

B.
A feature multicore processors, where a core can be given processing priority over the other
cores.

C.
A memory architecture feature, where specific data can be delivered to processors at the
fastest possible rate.

D.
A feature of certain operating systems, where programs are executed based on the availability
of data.