Further VLSM question please

[John Cheetley]

Thanks to Simon and Georg for breakdown of previous question..

I have another thanks

Which of the following options are examples of VLSM? (Choose three)
A. Taking the 192.168.1.0/27 and subnetting it to multiple /30s
B. Taking 192.168.1.0/24 and subnetting it to multiple /29s
C. Taking 172.16.1.0/24 and subnetting it to multiple /26s
D. Taking 10.1.24.128/26 and subnetting it to multiple /28s
E. Taking 172.16.0.0/16 and subnetting it to multiple /24s

Each of these are already subnetted and are VLSM as each CIDR has been done A shows. Was /27. Now to be /30

IE Like previous VLSM question

[Parth@1000]

As Per my view & my knowledge.
ANS is
192.168.1.0/27
172.16.1.0/24
10.1.24.128/26

This all network address have different Prefix Value compare to Default Subnet mask.
Default Subnet Mask
Class A : 255.0.0.0 Mean /8
Class B: 255.255.0.0 Mean /16
Class C: 255.255.255.0 Mean /24
VLSM allows to subnetting the same Subnetted network again.
to verify Please apply Subnetting, Check Block Size. & Usable IP add Per Subnet.
Please, Cross Verify the answer.