Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to become an internet provider [title] Find a suitable building to house the isp's data center. [step] Ideally, the building should have raised floors to route cables. [title] Purchase and install ups units, a diesel power generator and hvac units.

Ending1: [title] Verify you have the right number of php sources to support php emission filter operations. [title] Buy amplitude poles and plant data for php filters. Ending2: [step] These units are inexpensive and are able to help block you open the doors of the home and prevent your personal urination from happening. [title] Make sure all models fit your needs. Ending3: [step] The ups and diesel power generators are needed when city power is interrupted by a power outage. The hvac units are needed to keep the data center cool, because the equipment running the isps generates heat which can damage equipment. Ending4: [step] Alternatively, purchase hvac units and install them in the same second building with mounting and mounting as manufacturers. [title] Install the md 3 or newer in their original apartment.

Answer format: ending1/ending2/ending3/ending4