A.\(12\)
B.\(11\)
C.\(10\)
D.\(8\)

A.\(C\left( {0; - 1; - 2\sqrt 3 } \right)\)
B.\(C\left( {0; - 1;2\sqrt 3 } \right)\)
C.\(C\left( {1;0; - 2\sqrt 3 } \right)\)
D.\(C\left( { - 1;0;2\sqrt 3 } \right)\)

A.\(a \ge 0\)
B.\(a > 1\)
C.\(a < e\)
D.\(a \ge  - 1\)

A.\(\dfrac{{\sqrt 5 }}{5}\)
B.\(1\)
C.\(5\sqrt 5 \)
D.\(\sqrt 5 \)

A.\(8\)
B.\(10\)
C.\(4\)
D.\(3\)

A.\(R = \sqrt {14} \)
B.\(R = 14\)
C.\(R = 4\)
D.\(R = 2\)

A.\(\dfrac{4}{9}\)
B.\(\dfrac{5}{9}\)
C.\(\dfrac{1}{4}\)
D.\(\dfrac{1}{9}\)

A.\(\sin \alpha  = \dfrac{{\sqrt 2 }}{2}\)
B.\(\sin \alpha  = \dfrac{{2\sqrt 5 }}{5}\)
C.\(\sin \alpha  = \dfrac{1}{2}\)
D.\(\sin \alpha  = \dfrac{{\sqrt 5 }}{5}\)

A.\(1\)
B.\(2\)
C.\(3\)
D.\(4\)

A.\(m + n = 0\)
B.\(m + n = 2\)
C.\(m + n =  - 1\)
D.\(m + n = 1\)