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ip address

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An Internet Service Provider (ISP) has the following chunk of CIDR-based IP addresses available with it: 245.248.128.0/20.
The ISP wants to give half of this chunk of addresses to Organization A, and a quarter to Organization B, while retaining the remaining with itself. Which of the following is a valid allocation of addresses to A and B?
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245.248.128.0/20   to 245.248.143.255/20 (Total chunk)

Host A: 245.248.136.0/21  245.248.143.255/21 or 245.248.128.0/21  245.248.135.255/21

Considering Host A got -- 245.248.128.0/21  245.248.135.255/21

    Then Host B get 245.248.136.0/22  to  245.248.139.255/22

    Remaining 245.248.140.0/22  to 245.248.143.255/22
   
    or
   
    Then Host B get 245.248.140.0/22  to  245.248.143.255/22

    Remaining 245.248.136.0/22  to  245.248.139.255/22

Considering Host A got --245.248.136.0/21  245.248.143.255/21

    Then Host B get 245.248.128.0/22  to  245.248.131.255/22

    Remaining 245.248.132.0/22  to 245.248.135.255/22
   
    or
   
    Then Host B get 245.248.132.0/22  to 245.248.135.255/22

    Remaining 245.248.128.0/22  to  245.248.131.255/22
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