Which expression for YYY correctly outputs $"$x is between $50-100"?$

Flowchart has $1$ variable $($integer x$)$ and $5$ nodes. Node $1$ is the start node and points to node $2.$ Node $2$ code: x $=$ Get next input Node $2$ points to node $3.$ Node $3$ code: if YYY Node $3$ points to nodes $4($condition is true$)$ and $5($condition is false$).$ Node $4$ puts to output the string: x is between $50-100$ Node $4$ points to node $5.$ Node $5$ is the end node.

a$.$

$($x $>=50)$ or $($x $<=100)$

b$.$

$50>=$ x $<=100$

c$.$

$50<=$ x $<=100$

d$.$

$($x $>=50)$ and $($x $<=100)$