$[$This question relates to the previous questions $($McConaughey$\text{'}$s campaign$)]$

Your team has decided to launch a social media advertising campaign. The primary goal is to increase awareness about Matthew McConaughey's intent to run for governor and ensure more voters are informed about his campaign. Both higher reach and frequency are considered acceptable by the team. Based on this objective, which of the following options is the BEST performance measure $($linked to inputs or costs$)$ for evaluating the success of this social media marketing campaign?

Cost per Lead $($CPL$)$

Cost per Action $($CPA$)$

Cost per Thousand Impressions $($CPM$)$

Cost per Engagement $($CPE$)$

Cost per Click $($CPC$)$