For each statement below, indicate whether it is true or false and then explain $($your explanation must NOT

exceed one sentence.$)$

$($a$)$ In the real world, nowadays, all the OTC contracts are cleared via CCPs$.$

$($b$)$ Risky assets, such as stocks, cannot be used for margin requirements.

$($c$)$ Both sides of an OTC contract are required to put up collaterals.

$($d$)$ For futures contracts, marking to market is essentially a $$close$-$out$-$and$-$then$-$reissue$$ process