Which of the following is a compound-complex sentence?
Automated systems don't have specific tasks like product-assembling industrial robots, nevertheless, they have
become indispensable to many businesses.
Automated systems do not have specific tasks such as assembling products, but they have become indispensable to
many businesses.
Both industrial robots that assemble products and automated systems without specific tasks have become
indispensable to many businesses.
Unlike industrial robots that assemble products, automated systems do not have specific tasks, but they have
become indispensable to many businesses.