One of the disadvantages of cable technology is that:
a. it is more expensive than other signal carrying systems
b. while it works well for television signals, it is ineffective for data transmissions required by the internet
c. systems used by many providers require customers to share bandwidth with neighbors
d. it is incompatible with most modern communication systems
e. the speed of the connection rises in conjunction with the distance between the end customers from the central hub

The answer is letter C

Explanation:

Systems used by many providers require customers to share bandwidth with neighbors

to change your username, you must:

1) make sure what the username you want to change to is allowed in this community

2) contact a administrator (for example, jaysl)

3) through pm, tell the admin what you want to change to

4) if the username is allowed, it will be changed in a matter of seconds (minutes at most)

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the only way i would see could be an autoclicker type software. but that is very time consuming.