Final answer:
ISPs such as Comcast and Spectrum are typically providers for cable modem internet services. AT&T and Verizon are less common as they specialize in other services. ISPs are crucial in managing internet access and investment in the industry is influenced by their regulatory status.
Step-by-step explanation:
The Internet Service Provider (ISP) for a cable modem is typically a company that provides cable television and internet services. ISPs such as Comcast, Spectrum—formerly Charter Communications—and in some areas, companies like Cox Communications or Optimum (Altice USA) are commonly known for providing cable modem internet connectivity. Choices like AT&T and Verizon are primarily known for their telephone and fiber-optic services respectively.
It's important to recognize that ISPs play a critical role in how the internet is accessed and managed, and their designation as common carriers has implications for regulatory burdens and their ability to invest in service improvements and expansion.