Answer and Explanation:
Omnidirectional antenna are those antennas which receives the signals from multiple directions equally.These are the antennas that cannot get the signal from a particular direction thus gives the low throughput.
To get high throughput, directional antennas should be installed because they receive the signal from a particular direction only .Thus the signal received from these antenna work for a certain area.Example-Television antenna at homes are directional antennas names as Yagi-uda antennas.
First there are two groups, members and non-members, so you know that there are 4 people who are members, if you subtract 4 from ten that would mean 6 people are non-members. now, for the cost of the members would be (7.50 × 4) + (2.95 × 4) = 41.8$
for the non-member group or would be (9.75 × 6) + (3.95 ×6) = 82.2$ now add 41.8 to 82.2 which equals 124.0$ in total
grey hat hackers are those after hacking into ATM systems remotely using a laptop, works with the ATM manufacturers to resolve the identified security vulnerabilities
- A grey hat hacker is simply known as an hacker that falls between the range of black and white hacker. They are known to illegally break into systems so as to show off their skills to the administrator of the system they penetrated or to seek to sell their services in repairing security breaches.
- In the ATM case, they attacked it and then also want the ATM manufacturer to use their service.
Conclusively we can therefore say that the hacker was a gray hat hacker.
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