Which query would you use to count the number of stocks (ticker_symbols) within each sector?
A. SELECT sector, COUNT(ticker_symbol) FROM stocksdb.stocks_2023 GROUP BY sector;
B. SELECT COUNT(ticker_symbol) FROM stocksdb.stocks_2023 GROUP BY sector;
C. SELECT sector, ticker_symbol FROM stocksdb.stocks_2023;
D. SELECT sector, TOTAL(ticker_symbol) FROM stocksdb.stocks_2023 GROUP BY sector;