$($Aggregation with grouping$)$ Based on the plumbing supply store database from Chapter $7,$ write SQL queries to perform the following tasks:

A$.$ For each customer, show the Customer ID$,$ first name, last name, and the total number of orders placed.

B$.$ Show the same information about customers as in part $($a$),$ but count only orders placed since April $28,2013$; if a customer has placed no orders since that time, they need not appear in the output.