<h2>Piston rings help form a tight seal between the piston and cylinder.
Answer is A. Piston ring</h2>
Answer:

Explanation:
Given

Required
Write an equivalent expression in C
The given expression uses + and + is represented as + in C
So: The equivalent expression is

However, C supports compound assignment operators
So:
can be rewritten as

"Key logger" This could be software or hardware that does this.