The headmistress of the boarding school was a buttoned-up, austere woman with a tightly wound, slate-gray bun at the top of her head and clunky black shoes on her feet. She made sure that our uniforms were complete at inspection every morning, and if one of us dared to wear a warmer pair of socks than the thin, oatmeal-colored ones we were issued, there would be trouble. What does the use of the word austere imply?

that the headmistress is concerned about her students
that the headmistress is not a kind person
that the headmistress is kind to some students
that the headmistress is uncomfortable