Consider two grammars $G_1$ and $G_2$ with the production rules given below:

$G_1: S \rightarrow$ if $E$ then $S \mid$ if $E$ then $S$ else $S \mid a$

$$\mathrm{E} \rightarrow \mathrm{~b}$$

$G_2: S \rightarrow$ if $E$ then $S \mid M$

$E \rightarrow$ if $E$ then $M$ else $S \mid c$

$$\mathrm{E} \rightarrow \mathrm{~b}$$

where if, then, else, $a, b, c$ are the terminals.

Which of the following option(s) is/are CORRECT?

Consider the following statements :

(i) Address Resolution Protocol (ARP) provides a mapping from an IP address to the corresponding hardware (link-layer) address.

(ii) A single TCP segment from a sender $S$ to a receiver $R$ cannot carry both data from $S$ to $R$ and acknowledgement for a segment from $R$ to $S$.

Which ONE of the following is CORRECT?

Consider the routing protocols given in List-I and the names given in List-II:

For matching of items in List-I with those in List-II, which ONE of the following options is CORRECT?

A machine receives an IPv4 datagram. The protocol field of the IPv4 header has the protocol number of a protocol X .

Which ONE of the following is NOT a possible candidate for X ?