AUD/USD holds above 0.6400 as higher iron ore prices lend support to AUD

Iron ore is Australia's biggest export earner. 0.6400 was Asian session low

0.6390 was five-month low Tuesday, after USD rose on hawkish Powell guidance

AUD/USD offers are tipped ahead of 0.6450 (0.6443 was February's low)

There is a big 0.6435 option expiry on Thursday; A$1.5 billion strike

Australian jobs data due Thursday: employment f/c 10k; jobless rate f/c 3.9%