If a company develops a new technology that improves its main product, the most appropriate type of intellectual property they can use to stop others from copying their invention is patents.
Patents provide legal protection for inventions, allowing the inventor to exclude others from making, using, selling, or distributing the patented technology for a certain period, typically 20 years from the filing date.
The other options (copyright, registered designs, trademarks, and geographical indications) serve different purposes and do not specifically protect inventions or technological improvements in the same way patents do.