Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to install a modem [title] Make sure that your modem will work with your internet subscription. [step] While rare, some modems encounter issues when paired with a specific internet company (e.g., comcast). Double-check your modem's compatibility with your current internet subscription before buying (if possible).

Ending1: [substeps] Generally, you'll have the option of installing a modem while internet subscription is enabled. This is a good option if your internet subscription doesn't normally infuse with internet connection configuration. Ending2: [substeps] If you find that your modem won't work with your current subscription, try to exchange the modem for a different one that will work, or switch your internet subscription. [title] Find your room's cable output. Ending3: [substeps] You can buy both individually and separately, if you choose. They may also be possible if your internet subscription has a separate option that allows you to install software for your way-of internet subscription. Ending4: [substeps] Some modems have difficulty with errors during setup; such errors can result from multiple connectors that run on one particular internet service, which can result in a defective modem. Check your modem's service profile to see if there are any problems with it.

Answer format: ending1/ending2/ending3/ending4