Solution :
Here, we need to perform JOIN operation of the students and registration.
Use NATURAL JOIN operator 
and so no need to specify Join condition.
Also we need to selection operator tp select only those course whose major in "philosophy".
Finally we projection operator π to project only distinct students name who took at least three courses.
![$\pi [\sigma_{\text{student's nam}e} [ \sigma(\text{three courses}) \Join \text{"Philosophy"}]]$](https://tex.z-dn.net/?f=%24%5Cpi%20%5B%5Csigma_%7B%5Ctext%7Bstudent%27s%20nam%7De%7D%20%5B%20%5Csigma%28%5Ctext%7Bthree%20courses%7D%29%20%5CJoin%20%5Ctext%7B%22Philosophy%22%7D%5D%5D%24)
Answer:
D.
Explanation:
Clipher
You can read the instructions
Answer:
1. I express myself through the designing, development and analysis of software and hardware used to solve problems in a variety of business, scientific and social contexts.
2. support the development of general reasoning, problem-solving and communication skills.
3. Through avoiding in repetious tasks and simplifying such works.
Answer:
C.) for priority-based scheduling algorithms
Explanation:
for priority-based scheduling algorithms
