Using the provided database answer the questions using relational algebra

• classroom
  • building string
  • room_number number
  • capacity number
• department
  • dept_name string
  • building string
  • budget number
• course
  • course_id string
  • title string
  • dept_name string
  • credits number
• instructor
  • ID number
  • name string
  • dept_name string
  • salary number
• section
  • course_id string
  • sec_id number
  • semester string
  • year number
  • building string
  • room_number number
  • time_slot_id string
• teaches
  • ID number
  • course_id string
  • sec_id number
  • semester string
  • year number
• student
  • ID number
  • name string
  • dept_name string
  • tot_cred number
• takes
  • ID number
  • course_id string
  • sec_id number
  • semester string
  • year number
  • grade string
• advisor
  • s_id number
  • i_id number
• time_slot
  • time_slot_id string
  • day string
  • start_hr number
  • start_min number
  • end_hr number
  • end_min number
• prereq
  • course_id string
  • prereq_id string

A- Building(s) student(s) Brown had classes in the Spring 2010 semester.

B- Name(s) and ID()s of student(s) that instructor(s) Gold taught.

C- Student(s) whose name(s) are the same as name(s) of some instructor(s). We are interested in ID(s) and name(s) of this\those student(s).

D- Course(s) for which only one section was created in the Spring 2009 semester.