Which of the following statements is true Question $19$ Select one: a$.$ CSS stands for Cascading Style Sheets. Styles define how to display XTML elements. Styles were added to HTML $5\mathrm{.}0$ to solve a problem. External Style Sheets can save a lot of work. External Style Sheets are stored in CSS files b$.$ CSS stands for Cascading Style Sheets. Styles define how to display HTML elements. Styles were added to HTML $5\mathrm{.}0$ to solve a problem. External Style Sheets can save a lot of work. External Style Sheets are stored in CSS files c$.$ CSS stands for Cascading Style Sheets. Styles define how to display HTML elements. Styles were added to HTML $4\mathrm{.}0$ to solve a problem. External Style Sheets can save a lot of work. External Style Sheets are stored in CLSS files d$.$ CSS stands for Cascading Style Sheets. Styles define how to display HTML elements. Styles were added to HTML $4\mathrm{.}0$ to solve a problem. External Style Sheets can save a lot of work. External Style Sheets are stored in CSS files