Where his subsequent supply of investment gold is exempt pursuant to this Chapter, the taxable person shall be entitled to deduct the following:
(a)
the VAT due or paid in respect of investment gold supplied to him by a person who has exercised the right of option under Articles 348 and 349 or supplied to him in accordance with Section 4;
(b)
the VAT due or paid in respect of a supply to him, or in respect of an intra-Community acquisition or importation carried out by him, of gold other than investment gold which is subsequently transformed by him or on his behalf into investment gold;
(c)
the VAT due or paid in respect of services supplied to him consisting in a change of form, weight or purity of gold including investment gold.