Question 10\ 5 points\ others.\

\\\\pi R.c,S.e((\\\\sigma _(b)

))

=

(

8R)|

|

>

|

=

(

S.cS)

\ II.

((\\\\pi _(c)(\\\\sigma _(b)

)))

=

(((

8R))aleph_(c)(\\\\pi _(c),eS))

\ III.

\\\\pi R.c,S.e(\\\\sigma _(b)

)

=8(Raleph_(R.c)

)

=

((

S.cS))

\ N.

\\\\pi R*C,Se(\\\\sigma _(b)

)

=

(

8(R\\\\times S))

\ A. I\ B. II\ C. IV\ D. III

One of the following four expressions of relational algebra is not equivalent to the other three. They are all based on the relations R(A,B,C) and S(D,E,F). Indicate which is not equivalent to the others. 1. R.c,S.e((b=8R)R.c=S.cS) II. ((c(b=8R))c(c,eS)) III. R.c,S.e(b=8(RR.c=S.cS)) N. R.C,S.e(b=8(RS)) A. I B. II C. IV D