$A = \lbrace 5, 7, 9 \rbrace, B = \lbrace 6,7 \rbrace$

Check ALL of the following Cartesian products to which the following elements belong:
(c) $(5,5)$

A. $B \times A$
B. $B \times B$
C. $A \times A$
D. $A \times B$

(b) $(7,5)$

A. $A \times A$
B. $B \times A$
C. $B \times B$
D. $A \times B$

(d) $(7,7)$

A. $B \times A$
B. $A \times A$
C. $B \times B$
D. $A \times B$

(a) $(5, 6)$

A. $B \times B$
B. $A \times A$
C. $B \times A$
D. $A \times B$