KöMaL 2023 B5350

$a)$ Is it possible to find positive integers $a$, $b$, $c$ and $d$ such that the arithmetic mean of $a$ and $b$ is greater than the quadratic mean of $c$ and $d$, however, the geometric mean of $a$ and $b$ is smaller than the harmonic mean of $c$ and $d$? $b)$ Is it possible to find positive integers $a$, $b$, $c$ and $d$ such that the geometric mean of $a$ and $b$ is greater than the quadratic mean of $c$ and $d$, however, the arithmetic mean of $a$ and $b$ is smaller than the harmonic mean of $c$ and $d$?