Which of the following are valid field names of the table: Employee?

1. empid, ename, esalary
2. empid, ename, stu_name
3. stu_Id, ename, esalary
4. stu_Id, ename, stu_name

Which of the following is not an example of DBMS?

1. MySQL
2. Microsoft Access
3. IBM DB2
4. Google

Assertion (A): Database management system is an application software which arranges data in a well-organized manner in the form of tables.

Reasoning (R): DBMS acts as an interface between the database stored in the computer memory and the user.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): In hierarchical model, the data is organized in a tree-like structure.

Reasoning (R): In hierarchical model, searching for a particular record is a time-consuming process.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.