12 If an Internet Service Provider (ISP) has the following chunk of CIDR-based IP addresses available with it:245.248.128.0/20 and the ISP wants to give half of this chunk of address to Organization...

Extracted text: 12 If an Internet Service Provider (ISP) has the following chunk of CIDR-based IP addresses available with it:245.248.128.0/20 and the ISP wants to give half of this chunk of address to Organization A, and a quarter to Organization B, while retaining the remaining with itself. Then, which among the following is a valid allocation of addresses to A and B? 245.248.136.0/21 and 245.248.128.0/22 245.248.136.0/24 and 245.248.132.0/21 245.248.128.0/21 and 245.248.128.0/22 245.248.132.0/22 and 245.248.132.0/21