Consider a scenario where you have a std::vector<int> named numbers containing the values \( [10,20,30,40,50] \).
You need to use an iterator to find and print the sum of all the elements in the vector.
Which code snippet accomplishes this task correctly?
a. vector<int> numbers \( =\{10,20,30,40,50\} \);
int sum \( =0 \);
for (int num : numbers) \{
sum \( += \) num;
\}
b. vector<int> numbers \( =\{10,20,30,40,50\} \);
int sum = 0 ;
for (auto it = numbers.begin(); it \( != \) numbers.end(); + + sum \( += \) *it;
\}
c. vector<int> numbers \( =\{10,20,30,40,50\} \);
```
int sum = 0;
for (unsigned int i = 0; i < numbers.size(); ++i) {
sum += numbers[i];
}
```
d. vector<int> numbers \( =\{10,20,30,40,50\} \);
```
int sum = 0;
for (auto& num : numbers) {
sum += num;
}
```
