Which of the following is occurring?

From the two screenshots below, which of the following is occurring?
First one:
1 [10.0.0.253]# nmap -sP 10.0.0.0/24
2
3 Starting Nmap
5 Host 10.0.0.1 appears to be up. 6 MAC Address: 00:09:5B:29:FD:96 (Netgear) 7 Host 10.0.0.2 appears to be up. 8 MAC Address: 00:0F:B5:96:38:5D (Netgear)
9 Host 10.0.0.4 appears to be up.
10Host 10.0.0.5 appears to be up.
11MAC Address: 00:14:2A:B1:1E:2E (Elitegroup Computer System Co.) 12 Nmap finished: 256 IP addresses (4 hosts up) scanned in 5.399 seconds
Second one:
1 [10.0.0.252]# nmap -sO 10.0.0.2
2
3 Starting Nmap 4.01 at 2006-07-14 12:56 BST 4 Interesting protocols on 10.0.0.2:
5(The 251 protocols scanned but not shown below are
6in state: closed)
7PROTOCOL STATE SERVICE
81 open icmp
92 open|filtered igmp10 6 open tcp
1117 open udp
12255 open|filtered unknown
13
14Nmap finished: 1 IP address (1 host up) scanned in 151.259 seconds
A. 10.0.0.253 is performing an IP scan against 10.0.0.0/24, 10.0.0.252 is performing a port scan against 10.0.0.2.
B. 10.0.0.253 is performing an IP scan against 10.0.0.2, 10.0.0.252 is performing a port scan against 10.0.0.2.
C. 10.0.0.2 is performing an IP scan against 10.0.0.0/24, 10.0.0.252 is performing a port scan against 10.0.0.2.
D. 10.0.0.252 is performing an IP scan against 10.0.0.2, 10.0.0.252 is performing a port scan against 10.0.0.2.

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