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I think A is the best concluding sentence
Both of the sun and lion represent brave
Landlady wanted Billy to sign the guestbook,
Option (d);
<u>EXPLANATION: </u>
The story 'The Landlady' by Roald Dahl is a story of a '17-year old boy', Billy Weaver, who arrives in the new city. He wanted to make a good name in the world of business.
He is welcomed by an old landlady. She showed Billy his room and then insisted he sign in the guestbook. Though he found that there were only two names in that guestbook but still he believed the landlady.
Also, the landlady conveys the statement that it is the law for everyone to sign the guestbook before entering into the room.
The ability of computer systems or software to exchange and make use of information."interoperability between devices made by different manufacturers"the ability of military equipment or groups to operate in conjunction with each other."staff believe interoperability between forces is crucial to effectiveness"
