Which statements about interiors and exteriors of the pyramid entrance at the Louvre by I. M. Pei and the Metropolitan Cathedral by Oscar Niemeyer are true? Choose all answers that are correct.

Pei preferred using the same kinds of materials used since medieval times.

Pei used a steel structure and glass to frame the view of the Louvre and sky.

Niemeyer used stained glass to create a heavenly light and spiritual mood.

Niemeyer focused on fluid curves; Pei on straight-edged geometric shapes and forms.