Answer B: Asymmetric cryptography, because the receiver has its own decryption key and cannot create encrypted messages, because he doesn't have the encryption key.
About the other answers:
A: Private keys are always involved, there has to be some secret to do encryption, so this answer doesn't say very much.
C: Digital signatures can be used to verify/prove some data comes from some person (the signer) in an unaltered way. It is not about encryption, so is not about the security of your message. You use it in combination with encryption.
D: Like A, this doesn't say very much. Shared secret keys (symmetric keys) can be used for encryption, but they are less secure since the keys have to exist in more than one place (sender and receiver).
I would suggest the answer would be both A and D, mail merge is used to specify different field for different recipients.
Answer:
Check explanation
Explanation:
# include <iostream>
using namespace std;
int main()
{
char op;
float a, b;
cout << "Enter operator either + or - or * or /: ";
cin >> op;
cout << "Enter two operands: ";
cin >> num1 >> num2;
switch(op)
{
case '+':
cout << a + b;
break;
case '-':
cout << a - b;
break;
case '*':
cout << a * b;
break;
case '/':
cout << a / b;
break;
default:
cout << "This operator is not valid. Please try again.";
break;
}
return 0;
}
Answer: Packets are the small unit of data that is sent from source to destination on a network.
Explanation: Packets are small packages that carry data in a packet form and is used from transferring it on internet or any kind of packet-switched network. They use the internet protocol (IP) for the transmission of data.
Example: packet radio is a sort of digital radio that uses the packet for transmission of data to other nodes by utilizing the AX-25 protocol.