Which one of the following is FALSE?

Let us evaluate each statement:

• (A) *A basic block is a sequence of instructions where control enters the sequence at the beginning and exits at the end.* — True, this is the standard definition of a basic block.

• (B) *Available expression analysis can be used for common subexpression elimination.* — True, available expressions identify expressions that have already been computed and not modified, enabling common subexpression elimination.

• (C) *Live variable analysis can be used for dead code elimination.* — True, if a variable is not live after an assignment, that assignment is dead code and can be eliminated.

• (D) *$x = 4 * 5 \Rightarrow x = 20$ is an example of common subexpression elimination.* — False, simplifying constant arithmetic expressions at compile time is an example of constant folding, not common subexpression elimination.

Therefore, statement (D) is FALSE.