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What is the purpose of the JDBC `Batch` processing feature? Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have a default constructor. Which of the following is correct? 1. A a = new A(); 2. A a = new B(); 3. B b = new A(); 4. B b = new B(); What will be the type of output of vector cross product? What will be the output of the following C++ code? #include <iostream> #include <string> #include <tuple> using namespace std; int main() { tuple <int, char, string> tp; tp = make_tuple(4, '1', "Hello"); cout<<get<0>(tp)<<endl; cout<<get<1>(tp)<<endl; cout<<get<2>(tp)<<endl; return 0; } What is the purpose of Flume Agents in the Flume architecture?