Subnetting [closed]

Question

With an IP address of 100, you currently have 80 subnets. What subnet mask should you use to maximize the number of available hosts?

A. 222

B. 233

C. 241

D.252

Comments

is this a valid question?

From where you get this question?

---

I got this question on-

https://www.quora.com/With-an-IP-address-of-100-you-currently-have-80-subnets-What-subnet-mask-should-you-use-to-maximize-the-number-of-available-hosts

It was asked in SBI IT officer's exam..
I also felt that this ques is wrong.