A user is seeing high replica lag on reader instances in a multi$-$AZ cluster. Which of the following holds true in this scenario? $($ Select all that apply$)$

$-$ user should use flow contorl to resolve replica lag

$-$ Failover functionality will not be available until the lag is resovled

$-$ user should failover to one of the readers to relax workload on the wirter instance.

$-$ user should disable replication to external databases to reduce replica lag