Answer:
D- Trojan Horse
Explanation:
Trojan horse is a malware that has hidden code and look legitimate in order to damage or transfer harmful action on the computer.
Example hackers can disguise as Trojan horse by spying on the victims computer in order to gain access to sensitive data on the computer over the network.
Could be 'home or work' or intranet. Not enough context to answer any better.
Answer:
The different variable in C is 21213316700.
Explanation:
Given value:
Total value = letters + underscore value
Total value = 52 + 1
Total value =53
choice for first character = 53 letters +10 digits
first character = 63
choice for remaining characters
So,
Variable number With one 1 character = 53
Variable number With 2 character = 53 × 63
Variable number With 3 character = 53 × 63²
Variable number With 4 character = 53 × 63³
.
.
.
Variable number With 7 character = 
Total difference variable = 53 + 53 × 63+ 53 × 63²+ 53 × 63³+....+ 
Total difference variable = 53(1 + 63 + 63²+ 63³+ .... +
)
Formula:

Total difference variable

Answer:
// code to read grade
#include <stdio.h>
// main function
int main(void) {
// if grade is character
char grade;
// if grade is numeric then we can use int or double
// int grade;
// double grade;
printf("Enter your grade:");
// read grade from user
scanf("%c",&grade);
// print grade
printf("your grade is:%c",grade);
return 0;
}
Explanation:
To read a value, scanf() function is used from stdio.h.Read a grade from user and assign it to variable "grade".
Output:
Enter your grade:A
your grade is:A
// code to read die volt
#include <stdio.h>
// main function
int main(void) {
// variable
double die_volt;
printf("Enter die volt:");
// read die volt from user
scanf("%lf",&die_volt);
// print die volt
printf("Entered die volt is:%0.2lf",die_volt);
return 0;
}
Explanation:
Read the die volt from user and assign it to variable "die_volt" with the help
of scanf() function.
Output:
Enter die volt:220
Entered die volt is:220.00