Which of the following property adjusts the font-size of the fallback fonts defi

Which of the following property adjusts the font-size of the fallback fonts defined with font-family, so that the x-height is the same no matter what font is used?

2) Which of the following property allows contextual adjustment of inter-glyph spacing, i.e. the spaces between the characters in text?

3) Which of the following font-size-adjust is value used in calculating the size of the fallback fonts?

4) Which of the following value specifies whether the user agent is allowed to synthesize bold or oblique font faces when a font family lacks bold or italic faces?

5) Which of the following value is supposed to be a slightly bolder weight that standard bold in font attribute?