Which statement accurately describes the relationship between parent or Main and child or subprocesses regarding extension application using a Process Route step?

$1)$Parent or Main processes deploy child or subprocesses without sharing extensions, maintaining separate extension scopes.

$2)$Parent or Main process extensions affect only child or subprocesses, whereas child$-$defined extensions impact both the parent or Main process and other children or subprocesses.

$3)$Child or subprocesses deploy independently from the parent or main process, inheriting the parent or main's extensions without altering them.

$4)$Extensions defined in child or subprocesses affect only the respective child or subprocess without impacting the Parent or Main or other child or subprocesses.